drivers/md/md.c

   1 /*
   2    md.c : Multiple Devices driver for Linux
   3           Copyright (C) 1998, 1999, 2000 Ingo Molnar
   4
   5      completely rewritten, based on the MD driver code from Marc Zyngier
   6
   7    Changes:
   8
   9    - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
  10    - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
  11    - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
  12    - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
  13    - kmod support by: Cyrus Durgin
  14    - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
  15    - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
  16
  17    - lots of fixes and improvements to the RAID1/RAID5 and generic
  18      RAID code (such as request based resynchronization):
  19
  20      Neil Brown <neilb@cse.unsw.edu.au>.
  21
  22    - persistent bitmap code
  23      Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
  24
  25    This program is free software; you can redistribute it and/or modify
  26    it under the terms of the GNU General Public License as published by
  27    the Free Software Foundation; either version 2, or (at your option)
  28    any later version.
  29
  30    You should have received a copy of the GNU General Public License
  31    (for example /usr/src/linux/COPYING); if not, write to the Free
  32    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33 */
  34
  35 #include <linux/kthread.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/buffer_head.h> /* for invalidate_bdev */
  40 #include <linux/poll.h>
  41 #include <linux/ctype.h>
  42 #include <linux/hdreg.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/random.h>
  45 #include <linux/reboot.h>
  46 #include <linux/file.h>
  47 #include <linux/delay.h>
  48 #include <linux/raid/md_p.h>
  49 #include <linux/raid/md_u.h>
  50 #include "md.h"
  51 #include "bitmap.h"
  52
  53 #define DEBUG 0
  54 #define dprintk(x...) ((void)(DEBUG && printk(x)))
  55
  56
  57 #ifndef MODULE
  58 static void autostart_arrays(int part);
  59 #endif
  60
  61 static LIST_HEAD(pers_list);
  62 static DEFINE_SPINLOCK(pers_lock);
  63
  64 static void md_print_devices(void);
  65
  66 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
  67
  68 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
  69
  70 /*
  71  * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
  72  * is 1000 KB/sec, so the extra system load does not show up that much.
  73  * Increase it if you want to have more _guaranteed_ speed. Note that
  74  * the RAID driver will use the maximum available bandwidth if the IO
  75  * subsystem is idle. There is also an 'absolute maximum' reconstruction
  76  * speed limit - in case reconstruction slows down your system despite
  77  * idle IO detection.
  78  *
  79  * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
  80  * or /sys/block/mdX/md/sync_speed_{min,max}
  81  */
  82
  83 static int sysctl_speed_limit_min = 1000;
  84 static int sysctl_speed_limit_max = 200000;
  85 static inline int speed_min(mddev_t *mddev)
  86 {
  87         return mddev->sync_speed_min ?
  88                 mddev->sync_speed_min : sysctl_speed_limit_min;
  89 }
  90
  91 static inline int speed_max(mddev_t *mddev)
  92 {
  93         return mddev->sync_speed_max ?
  94                 mddev->sync_speed_max : sysctl_speed_limit_max;
  95 }
  96
  97 static struct ctl_table_header *raid_table_header;
  98
  99 static ctl_table raid_table[] = {
 100         {
 101                 .ctl_name       = DEV_RAID_SPEED_LIMIT_MIN,
 102                 .procname       = "speed_limit_min",
 103                 .data           = &sysctl_speed_limit_min,
 104                 .maxlen         = sizeof(int),
 105                 .mode           = S_IRUGO|S_IWUSR,
 106                 .proc_handler   = &proc_dointvec,
 107         },
 108         {
 109                 .ctl_name       = DEV_RAID_SPEED_LIMIT_MAX,
 110                 .procname       = "speed_limit_max",
 111                 .data           = &sysctl_speed_limit_max,
 112                 .maxlen         = sizeof(int),
 113                 .mode           = S_IRUGO|S_IWUSR,
 114                 .proc_handler   = &proc_dointvec,
 115         },
 116         { .ctl_name = 0 }
 117 };
 118
 119 static ctl_table raid_dir_table[] = {
 120         {
 121                 .ctl_name       = DEV_RAID,
 122                 .procname       = "raid",
 123                 .maxlen         = 0,
 124                 .mode           = S_IRUGO|S_IXUGO,
 125                 .child          = raid_table,
 126         },
 127         { .ctl_name = 0 }
 128 };
 129
 130 static ctl_table raid_root_table[] = {
 131         {
 132                 .ctl_name       = CTL_DEV,
 133                 .procname       = "dev",
 134                 .maxlen         = 0,
 135                 .mode           = 0555,
 136                 .child          = raid_dir_table,
 137         },
 138         { .ctl_name = 0 }
 139 };
 140
 141 static const struct block_device_operations md_fops;
 142
 143 static int start_readonly;
 144
 145 /*
 146  * We have a system wide 'event count' that is incremented
 147  * on any 'interesting' event, and readers of /proc/mdstat
 148  * can use 'poll' or 'select' to find out when the event
 149  * count increases.
 150  *
 151  * Events are:
 152  *  start array, stop array, error, add device, remove device,
 153  *  start build, activate spare
 154  */
 155 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
 156 static atomic_t md_event_count;
 157 void md_new_event(mddev_t *mddev)
 158 {
 159         atomic_inc(&md_event_count);
 160         wake_up(&md_event_waiters);
 161 }
 162 EXPORT_SYMBOL_GPL(md_new_event);
 163
 164 /* Alternate version that can be called from interrupts
 165  * when calling sysfs_notify isn't needed.
 166  */
 167 static void md_new_event_inintr(mddev_t *mddev)
 168 {
 169         atomic_inc(&md_event_count);
 170         wake_up(&md_event_waiters);
 171 }
 172
 173 /*
 174  * Enables to iterate over all existing md arrays
 175  * all_mddevs_lock protects this list.
 176  */
 177 static LIST_HEAD(all_mddevs);
 178 static DEFINE_SPINLOCK(all_mddevs_lock);
 179
 180
 181 /*
 182  * iterates through all used mddevs in the system.
 183  * We take care to grab the all_mddevs_lock whenever navigating
 184  * the list, and to always hold a refcount when unlocked.
 185  * Any code which breaks out of this loop while own
 186  * a reference to the current mddev and must mddev_put it.
 187  */
 188 #define for_each_mddev(mddev,tmp)                                       \
 189                                                                         \
 190         for (({ spin_lock(&all_mddevs_lock);                            \
 191                 tmp = all_mddevs.next;                                  \
 192                 mddev = NULL;});                                        \
 193              ({ if (tmp != &all_mddevs)                                 \
 194                         mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
 195                 spin_unlock(&all_mddevs_lock);                          \
 196                 if (mddev) mddev_put(mddev);                            \
 197                 mddev = list_entry(tmp, mddev_t, all_mddevs);           \
 198                 tmp != &all_mddevs;});                                  \
 199              ({ spin_lock(&all_mddevs_lock);                            \
 200                 tmp = tmp->next;})                                      \
 201                 )
 202
 203
 204 /* Rather than calling directly into the personality make_request function,
 205  * IO requests come here first so that we can check if the device is
 206  * being suspended pending a reconfiguration.
 207  * We hold a refcount over the call to ->make_request.  By the time that
 208  * call has finished, the bio has been linked into some internal structure
 209  * and so is visible to ->quiesce(), so we don't need the refcount any more.
 210  */
 211 static int md_make_request(struct request_queue *q, struct bio *bio)
 212 {
 213         mddev_t *mddev = q->queuedata;
 214         int rv;
 215         if (mddev == NULL || mddev->pers == NULL) {
 216                 bio_io_error(bio);
 217                 return 0;
 218         }
 219         rcu_read_lock();
 220         if (mddev->suspended) {
 221                 DEFINE_WAIT(__wait);
 222                 for (;;) {
 223                         prepare_to_wait(&mddev->sb_wait, &__wait,
 224                                         TASK_UNINTERRUPTIBLE);
 225                         if (!mddev->suspended)
 226                                 break;
 227                         rcu_read_unlock();
 228                         schedule();
 229                         rcu_read_lock();
 230                 }
 231                 finish_wait(&mddev->sb_wait, &__wait);
 232         }
 233         atomic_inc(&mddev->active_io);
 234         rcu_read_unlock();
 235         rv = mddev->pers->make_request(q, bio);
 236         if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended)
 237                 wake_up(&mddev->sb_wait);
 238
 239         return rv;
 240 }
 241
 242 static void mddev_suspend(mddev_t *mddev)
 243 {
 244         BUG_ON(mddev->suspended);
 245         mddev->suspended = 1;
 246         synchronize_rcu();
 247         wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
 248         mddev->pers->quiesce(mddev, 1);
 249         md_unregister_thread(mddev->thread);
 250         mddev->thread = NULL;
 251         /* we now know that no code is executing in the personality module,
 252          * except possibly the tail end of a ->bi_end_io function, but that
 253          * is certain to complete before the module has a chance to get
 254          * unloaded
 255          */
 256 }
 257
 258 static void mddev_resume(mddev_t *mddev)
 259 {
 260         mddev->suspended = 0;
 261         wake_up(&mddev->sb_wait);
 262         mddev->pers->quiesce(mddev, 0);
 263 }
 264
 265 int mddev_congested(mddev_t *mddev, int bits)
 266 {
 267         return mddev->suspended;
 268 }
 269 EXPORT_SYMBOL(mddev_congested);
 270
 271
 272 static inline mddev_t *mddev_get(mddev_t *mddev)
 273 {
 274         atomic_inc(&mddev->active);
 275         return mddev;
 276 }
 277
 278 static void mddev_delayed_delete(struct work_struct *ws);
 279
 280 static void mddev_put(mddev_t *mddev)
 281 {
 282         if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
 283                 return;
 284         if (!mddev->raid_disks && list_empty(&mddev->disks) &&
 285             !mddev->hold_active) {
 286                 list_del(&mddev->all_mddevs);
 287                 if (mddev->gendisk) {
 288                         /* we did a probe so need to clean up.
 289                          * Call schedule_work inside the spinlock
 290                          * so that flush_scheduled_work() after
 291                          * mddev_find will succeed in waiting for the
 292                          * work to be done.
 293                          */
 294                         INIT_WORK(&mddev->del_work, mddev_delayed_delete);
 295                         schedule_work(&mddev->del_work);
 296                 } else
 297                         kfree(mddev);
 298         }
 299         spin_unlock(&all_mddevs_lock);
 300 }
 301
 302 static mddev_t * mddev_find(dev_t unit)
 303 {
 304         mddev_t *mddev, *new = NULL;
 305
 306  retry:
 307         spin_lock(&all_mddevs_lock);
 308
 309         if (unit) {
 310                 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
 311                         if (mddev->unit == unit) {
 312                                 mddev_get(mddev);
 313                                 spin_unlock(&all_mddevs_lock);
 314                                 kfree(new);
 315                                 return mddev;
 316                         }
 317
 318                 if (new) {
 319                         list_add(&new->all_mddevs, &all_mddevs);
 320                         spin_unlock(&all_mddevs_lock);
 321                         new->hold_active = UNTIL_IOCTL;
 322                         return new;
 323                 }
 324         } else if (new) {
 325                 /* find an unused unit number */
 326                 static int next_minor = 512;
 327                 int start = next_minor;
 328                 int is_free = 0;
 329                 int dev = 0;
 330                 while (!is_free) {
 331                         dev = MKDEV(MD_MAJOR, next_minor);
 332                         next_minor++;
 333                         if (next_minor > MINORMASK)
 334                                 next_minor = 0;
 335                         if (next_minor == start) {
 336                                 /* Oh dear, all in use. */
 337                                 spin_unlock(&all_mddevs_lock);
 338                                 kfree(new);
 339                                 return NULL;
 340                         }
 341
 342                         is_free = 1;
 343                         list_for_each_entry(mddev, &all_mddevs, all_mddevs)
 344                                 if (mddev->unit == dev) {
 345                                         is_free = 0;
 346                                         break;
 347                                 }
 348                 }
 349                 new->unit = dev;
 350                 new->md_minor = MINOR(dev);
 351                 new->hold_active = UNTIL_STOP;
 352                 list_add(&new->all_mddevs, &all_mddevs);
 353                 spin_unlock(&all_mddevs_lock);
 354                 return new;
 355         }
 356         spin_unlock(&all_mddevs_lock);
 357
 358         new = kzalloc(sizeof(*new), GFP_KERNEL);
 359         if (!new)
 360                 return NULL;
 361
 362         new->unit = unit;
 363         if (MAJOR(unit) == MD_MAJOR)
 364                 new->md_minor = MINOR(unit);
 365         else
 366                 new->md_minor = MINOR(unit) >> MdpMinorShift;
 367
 368         mutex_init(&new->open_mutex);
 369         mutex_init(&new->reconfig_mutex);
 370         INIT_LIST_HEAD(&new->disks);
 371         INIT_LIST_HEAD(&new->all_mddevs);
 372         init_timer(&new->safemode_timer);
 373         atomic_set(&new->active, 1);
 374         atomic_set(&new->openers, 0);
 375         atomic_set(&new->active_io, 0);
 376         spin_lock_init(&new->write_lock);
 377         init_waitqueue_head(&new->sb_wait);
 378         init_waitqueue_head(&new->recovery_wait);
 379         new->reshape_position = MaxSector;
 380         new->resync_min = 0;
 381         new->resync_max = MaxSector;
 382         new->level = LEVEL_NONE;
 383
 384         goto retry;
 385 }
 386
 387 static inline int mddev_lock(mddev_t * mddev)
 388 {
 389         return mutex_lock_interruptible(&mddev->reconfig_mutex);
 390 }
 391
 392 static inline int mddev_is_locked(mddev_t *mddev)
 393 {
 394         return mutex_is_locked(&mddev->reconfig_mutex);
 395 }
 396
 397 static inline int mddev_trylock(mddev_t * mddev)
 398 {
 399         return mutex_trylock(&mddev->reconfig_mutex);
 400 }
 401
 402 static inline void mddev_unlock(mddev_t * mddev)
 403 {
 404         mutex_unlock(&mddev->reconfig_mutex);
 405
 406         md_wakeup_thread(mddev->thread);
 407 }
 408
 409 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
 410 {
 411         mdk_rdev_t *rdev;
 412
 413         list_for_each_entry(rdev, &mddev->disks, same_set)
 414                 if (rdev->desc_nr == nr)
 415                         return rdev;
 416
 417         return NULL;
 418 }
 419
 420 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
 421 {
 422         mdk_rdev_t *rdev;
 423
 424         list_for_each_entry(rdev, &mddev->disks, same_set)
 425                 if (rdev->bdev->bd_dev == dev)
 426                         return rdev;
 427
 428         return NULL;
 429 }
 430
 431 static struct mdk_personality *find_pers(int level, char *clevel)
 432 {
 433         struct mdk_personality *pers;
 434         list_for_each_entry(pers, &pers_list, list) {
 435                 if (level != LEVEL_NONE && pers->level == level)
 436                         return pers;
 437                 if (strcmp(pers->name, clevel)==0)
 438                         return pers;
 439         }
 440         return NULL;
 441 }
 442
 443 /* return the offset of the super block in 512byte sectors */
 444 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
 445 {
 446         sector_t num_sectors = bdev->bd_inode->i_size / 512;
 447         return MD_NEW_SIZE_SECTORS(num_sectors);
 448 }
 449
 450 static int alloc_disk_sb(mdk_rdev_t * rdev)
 451 {
 452         if (rdev->sb_page)
 453                 MD_BUG();
 454
 455         rdev->sb_page = alloc_page(GFP_KERNEL);
 456         if (!rdev->sb_page) {
 457                 printk(KERN_ALERT "md: out of memory.\n");
 458                 return -ENOMEM;
 459         }
 460
 461         return 0;
 462 }
 463
 464 static void free_disk_sb(mdk_rdev_t * rdev)
 465 {
 466         if (rdev->sb_page) {
 467                 put_page(rdev->sb_page);
 468                 rdev->sb_loaded = 0;
 469                 rdev->sb_page = NULL;
 470                 rdev->sb_start = 0;
 471                 rdev->sectors = 0;
 472         }
 473 }
 474
 475
 476 static void super_written(struct bio *bio, int error)
 477 {
 478         mdk_rdev_t *rdev = bio->bi_private;
 479         mddev_t *mddev = rdev->mddev;
 480
 481         if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
 482                 printk("md: super_written gets error=%d, uptodate=%d\n",
 483                        error, test_bit(BIO_UPTODATE, &bio->bi_flags));
 484                 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
 485                 md_error(mddev, rdev);
 486         }
 487
 488         if (atomic_dec_and_test(&mddev->pending_writes))
 489                 wake_up(&mddev->sb_wait);
 490         bio_put(bio);
 491 }
 492
 493 static void super_written_barrier(struct bio *bio, int error)
 494 {
 495         struct bio *bio2 = bio->bi_private;
 496         mdk_rdev_t *rdev = bio2->bi_private;
 497         mddev_t *mddev = rdev->mddev;
 498
 499         if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
 500             error == -EOPNOTSUPP) {
 501                 unsigned long flags;
 502                 /* barriers don't appear to be supported :-( */
 503                 set_bit(BarriersNotsupp, &rdev->flags);
 504                 mddev->barriers_work = 0;
 505                 spin_lock_irqsave(&mddev->write_lock, flags);
 506                 bio2->bi_next = mddev->biolist;
 507                 mddev->biolist = bio2;
 508                 spin_unlock_irqrestore(&mddev->write_lock, flags);
 509                 wake_up(&mddev->sb_wait);
 510                 bio_put(bio);
 511         } else {
 512                 bio_put(bio2);
 513                 bio->bi_private = rdev;
 514                 super_written(bio, error);
 515         }
 516 }
 517
 518 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
 519                    sector_t sector, int size, struct page *page)
 520 {
 521         /* write first size bytes of page to sector of rdev
 522          * Increment mddev->pending_writes before returning
 523          * and decrement it on completion, waking up sb_wait
 524          * if zero is reached.
 525          * If an error occurred, call md_error
 526          *
 527          * As we might need to resubmit the request if BIO_RW_BARRIER
 528          * causes ENOTSUPP, we allocate a spare bio...
 529          */
 530         struct bio *bio = bio_alloc(GFP_NOIO, 1);
 531         int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
 532
 533         bio->bi_bdev = rdev->bdev;
 534         bio->bi_sector = sector;
 535         bio_add_page(bio, page, size, 0);
 536         bio->bi_private = rdev;
 537         bio->bi_end_io = super_written;
 538         bio->bi_rw = rw;
 539
 540         atomic_inc(&mddev->pending_writes);
 541         if (!test_bit(BarriersNotsupp, &rdev->flags)) {
 542                 struct bio *rbio;
 543                 rw |= (1<<BIO_RW_BARRIER);
 544                 rbio = bio_clone(bio, GFP_NOIO);
 545                 rbio->bi_private = bio;
 546                 rbio->bi_end_io = super_written_barrier;
 547                 submit_bio(rw, rbio);
 548         } else
 549                 submit_bio(rw, bio);
 550 }
 551
 552 void md_super_wait(mddev_t *mddev)
 553 {
 554         /* wait for all superblock writes that were scheduled to complete.
 555          * if any had to be retried (due to BARRIER problems), retry them
 556          */
 557         DEFINE_WAIT(wq);
 558         for(;;) {
 559                 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
 560                 if (atomic_read(&mddev->pending_writes)==0)
 561                         break;
 562                 while (mddev->biolist) {
 563                         struct bio *bio;
 564                         spin_lock_irq(&mddev->write_lock);
 565                         bio = mddev->biolist;
 566                         mddev->biolist = bio->bi_next ;
 567                         bio->bi_next = NULL;
 568                         spin_unlock_irq(&mddev->write_lock);
 569                         submit_bio(bio->bi_rw, bio);
 570                 }
 571                 schedule();
 572         }
 573         finish_wait(&mddev->sb_wait, &wq);
 574 }
 575
 576 static void bi_complete(struct bio *bio, int error)
 577 {
 578         complete((struct completion*)bio->bi_private);
 579 }
 580
 581 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
 582                    struct page *page, int rw)
 583 {
 584         struct bio *bio = bio_alloc(GFP_NOIO, 1);
 585         struct completion event;
 586         int ret;
 587
 588         rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
 589
 590         bio->bi_bdev = bdev;
 591         bio->bi_sector = sector;
 592         bio_add_page(bio, page, size, 0);
 593         init_completion(&event);
 594         bio->bi_private = &event;
 595         bio->bi_end_io = bi_complete;
 596         submit_bio(rw, bio);
 597         wait_for_completion(&event);
 598
 599         ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
 600         bio_put(bio);
 601         return ret;
 602 }
 603 EXPORT_SYMBOL_GPL(sync_page_io);
 604
 605 static int read_disk_sb(mdk_rdev_t * rdev, int size)
 606 {
 607         char b[BDEVNAME_SIZE];
 608         if (!rdev->sb_page) {
 609                 MD_BUG();
 610                 return -EINVAL;
 611         }
 612         if (rdev->sb_loaded)
 613                 return 0;
 614
 615
 616         if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
 617                 goto fail;
 618         rdev->sb_loaded = 1;
 619         return 0;
 620
 621 fail:
 622         printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
 623                 bdevname(rdev->bdev,b));
 624         return -EINVAL;
 625 }
 626
 627 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
 628 {
 629         return  sb1->set_uuid0 == sb2->set_uuid0 &&
 630                 sb1->set_uuid1 == sb2->set_uuid1 &&
 631                 sb1->set_uuid2 == sb2->set_uuid2 &&
 632                 sb1->set_uuid3 == sb2->set_uuid3;
 633 }
 634
 635 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
 636 {
 637         int ret;
 638         mdp_super_t *tmp1, *tmp2;
 639
 640         tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
 641         tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
 642
 643         if (!tmp1 || !tmp2) {
 644                 ret = 0;
 645                 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
 646                 goto abort;
 647         }
 648
 649         *tmp1 = *sb1;
 650         *tmp2 = *sb2;
 651
 652         /*
 653          * nr_disks is not constant
 654          */
 655         tmp1->nr_disks = 0;
 656         tmp2->nr_disks = 0;
 657
 658         ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
 659 abort:
 660         kfree(tmp1);
 661         kfree(tmp2);
 662         return ret;
 663 }
 664
 665
 666 static u32 md_csum_fold(u32 csum)
 667 {
 668         csum = (csum & 0xffff) + (csum >> 16);
 669         return (csum & 0xffff) + (csum >> 16);
 670 }
 671
 672 static unsigned int calc_sb_csum(mdp_super_t * sb)
 673 {
 674         u64 newcsum = 0;
 675         u32 *sb32 = (u32*)sb;
 676         int i;
 677         unsigned int disk_csum, csum;
 678
 679         disk_csum = sb->sb_csum;
 680         sb->sb_csum = 0;
 681
 682         for (i = 0; i < MD_SB_BYTES/4 ; i++)
 683                 newcsum += sb32[i];
 684         csum = (newcsum & 0xffffffff) + (newcsum>>32);
 685
 686
 687 #ifdef CONFIG_ALPHA
 688         /* This used to use csum_partial, which was wrong for several
 689          * reasons including that different results are returned on
 690          * different architectures.  It isn't critical that we get exactly
 691          * the same return value as before (we always csum_fold before
 692          * testing, and that removes any differences).  However as we
 693          * know that csum_partial always returned a 16bit value on
 694          * alphas, do a fold to maximise conformity to previous behaviour.
 695          */
 696         sb->sb_csum = md_csum_fold(disk_csum);
 697 #else
 698         sb->sb_csum = disk_csum;
 699 #endif
 700         return csum;
 701 }
 702
 703
 704 /*
 705  * Handle superblock details.
 706  * We want to be able to handle multiple superblock formats
 707  * so we have a common interface to them all, and an array of
 708  * different handlers.
 709  * We rely on user-space to write the initial superblock, and support
 710  * reading and updating of superblocks.
 711  * Interface methods are:
 712  *   int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
 713  *      loads and validates a superblock on dev.
 714  *      if refdev != NULL, compare superblocks on both devices
 715  *    Return:
 716  *      0 - dev has a superblock that is compatible with refdev
 717  *      1 - dev has a superblock that is compatible and newer than refdev
 718  *          so dev should be used as the refdev in future
 719  *     -EINVAL superblock incompatible or invalid
 720  *     -othererror e.g. -EIO
 721  *
 722  *   int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
 723  *      Verify that dev is acceptable into mddev.
 724  *       The first time, mddev->raid_disks will be 0, and data from
 725  *       dev should be merged in.  Subsequent calls check that dev
 726  *       is new enough.  Return 0 or -EINVAL
 727  *
 728  *   void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
 729  *     Update the superblock for rdev with data in mddev
 730  *     This does not write to disc.
 731  *
 732  */
 733
 734 struct super_type  {
 735         char                *name;
 736         struct module       *owner;
 737         int                 (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
 738                                           int minor_version);
 739         int                 (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
 740         void                (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
 741         unsigned long long  (*rdev_size_change)(mdk_rdev_t *rdev,
 742                                                 sector_t num_sectors);
 743 };
 744
 745 /*
 746  * Check that the given mddev has no bitmap.
 747  *
 748  * This function is called from the run method of all personalities that do not
 749  * support bitmaps. It prints an error message and returns non-zero if mddev
 750  * has a bitmap. Otherwise, it returns 0.
 751  *
 752  */
 753 int md_check_no_bitmap(mddev_t *mddev)
 754 {
 755         if (!mddev->bitmap_file && !mddev->bitmap_offset)
 756                 return 0;
 757         printk(KERN_ERR "%s: bitmaps are not supported for %s\n",
 758                 mdname(mddev), mddev->pers->name);
 759         return 1;
 760 }
 761 EXPORT_SYMBOL(md_check_no_bitmap);
 762
 763 /*
 764  * load_super for 0.90.0
 765  */
 766 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
 767 {
 768         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
 769         mdp_super_t *sb;
 770         int ret;
 771
 772         /*
 773          * Calculate the position of the superblock (512byte sectors),
 774          * it's at the end of the disk.
 775          *
 776          * It also happens to be a multiple of 4Kb.
 777          */
 778         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
 779
 780         ret = read_disk_sb(rdev, MD_SB_BYTES);
 781         if (ret) return ret;
 782
 783         ret = -EINVAL;
 784
 785         bdevname(rdev->bdev, b);
 786         sb = (mdp_super_t*)page_address(rdev->sb_page);
 787
 788         if (sb->md_magic != MD_SB_MAGIC) {
 789                 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
 790                        b);
 791                 goto abort;
 792         }
 793
 794         if (sb->major_version != 0 ||
 795             sb->minor_version < 90 ||
 796             sb->minor_version > 91) {
 797                 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
 798                         sb->major_version, sb->minor_version,
 799                         b);
 800                 goto abort;
 801         }
 802
 803         if (sb->raid_disks <= 0)
 804                 goto abort;
 805
 806         if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
 807                 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
 808                         b);
 809                 goto abort;
 810         }
 811
 812         rdev->preferred_minor = sb->md_minor;
 813         rdev->data_offset = 0;
 814         rdev->sb_size = MD_SB_BYTES;
 815
 816         if (sb->level == LEVEL_MULTIPATH)
 817                 rdev->desc_nr = -1;
 818         else
 819                 rdev->desc_nr = sb->this_disk.number;
 820
 821         if (!refdev) {
 822                 ret = 1;
 823         } else {
 824                 __u64 ev1, ev2;
 825                 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
 826                 if (!uuid_equal(refsb, sb)) {
 827                         printk(KERN_WARNING "md: %s has different UUID to %s\n",
 828                                 b, bdevname(refdev->bdev,b2));
 829                         goto abort;
 830                 }
 831                 if (!sb_equal(refsb, sb)) {
 832                         printk(KERN_WARNING "md: %s has same UUID"
 833                                " but different superblock to %s\n",
 834                                b, bdevname(refdev->bdev, b2));
 835                         goto abort;
 836                 }
 837                 ev1 = md_event(sb);
 838                 ev2 = md_event(refsb);
 839                 if (ev1 > ev2)
 840                         ret = 1;
 841                 else
 842                         ret = 0;
 843         }
 844         rdev->sectors = rdev->sb_start;
 845
 846         if (rdev->sectors < sb->size * 2 && sb->level > 1)
 847                 /* "this cannot possibly happen" ... */
 848                 ret = -EINVAL;
 849
 850  abort:
 851         return ret;
 852 }
 853
 854 /*
 855  * validate_super for 0.90.0
 856  */
 857 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
 858 {
 859         mdp_disk_t *desc;
 860         mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
 861         __u64 ev1 = md_event(sb);
 862
 863         rdev->raid_disk = -1;
 864         clear_bit(Faulty, &rdev->flags);
 865         clear_bit(In_sync, &rdev->flags);
 866         clear_bit(WriteMostly, &rdev->flags);
 867         clear_bit(BarriersNotsupp, &rdev->flags);
 868
 869         if (mddev->raid_disks == 0) {
 870                 mddev->major_version = 0;
 871                 mddev->minor_version = sb->minor_version;
 872                 mddev->patch_version = sb->patch_version;
 873                 mddev->external = 0;
 874                 mddev->chunk_sectors = sb->chunk_size >> 9;
 875                 mddev->ctime = sb->ctime;
 876                 mddev->utime = sb->utime;
 877                 mddev->level = sb->level;
 878                 mddev->clevel[0] = 0;
 879                 mddev->layout = sb->layout;
 880                 mddev->raid_disks = sb->raid_disks;
 881                 mddev->dev_sectors = sb->size * 2;
 882                 mddev->events = ev1;
 883                 mddev->bitmap_offset = 0;
 884                 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
 885
 886                 if (mddev->minor_version >= 91) {
 887                         mddev->reshape_position = sb->reshape_position;
 888                         mddev->delta_disks = sb->delta_disks;
 889                         mddev->new_level = sb->new_level;
 890                         mddev->new_layout = sb->new_layout;
 891                         mddev->new_chunk_sectors = sb->new_chunk >> 9;
 892                 } else {
 893                         mddev->reshape_position = MaxSector;
 894                         mddev->delta_disks = 0;
 895                         mddev->new_level = mddev->level;
 896                         mddev->new_layout = mddev->layout;
 897                         mddev->new_chunk_sectors = mddev->chunk_sectors;
 898                 }
 899
 900                 if (sb->state & (1<<MD_SB_CLEAN))
 901                         mddev->recovery_cp = MaxSector;
 902                 else {
 903                         if (sb->events_hi == sb->cp_events_hi &&
 904                                 sb->events_lo == sb->cp_events_lo) {
 905                                 mddev->recovery_cp = sb->recovery_cp;
 906                         } else
 907                                 mddev->recovery_cp = 0;
 908                 }
 909
 910                 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
 911                 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
 912                 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
 913                 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
 914
 915                 mddev->max_disks = MD_SB_DISKS;
 916
 917                 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
 918                     mddev->bitmap_file == NULL)
 919                         mddev->bitmap_offset = mddev->default_bitmap_offset;
 920
 921         } else if (mddev->pers == NULL) {
 922                 /* Insist on good event counter while assembling */
 923                 ++ev1;
 924                 if (ev1 < mddev->events)
 925                         return -EINVAL;
 926         } else if (mddev->bitmap) {
 927                 /* if adding to array with a bitmap, then we can accept an
 928                  * older device ... but not too old.
 929                  */
 930                 if (ev1 < mddev->bitmap->events_cleared)
 931                         return 0;
 932         } else {
 933                 if (ev1 < mddev->events)
 934                         /* just a hot-add of a new device, leave raid_disk at -1 */
 935                         return 0;
 936         }
 937
 938         if (mddev->level != LEVEL_MULTIPATH) {
 939                 desc = sb->disks + rdev->desc_nr;
 940
 941                 if (desc->state & (1<<MD_DISK_FAULTY))
 942                         set_bit(Faulty, &rdev->flags);
 943                 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
 944                             desc->raid_disk < mddev->raid_disks */) {
 945                         set_bit(In_sync, &rdev->flags);
 946                         rdev->raid_disk = desc->raid_disk;
 947                 } else if (desc->state & (1<<MD_DISK_ACTIVE)) {
 948                         /* active but not in sync implies recovery up to
 949                          * reshape position.  We don't know exactly where
 950                          * that is, so set to zero for now */
 951                         if (mddev->minor_version >= 91) {
 952                                 rdev->recovery_offset = 0;
 953                                 rdev->raid_disk = desc->raid_disk;
 954                         }
 955                 }
 956                 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
 957                         set_bit(WriteMostly, &rdev->flags);
 958         } else /* MULTIPATH are always insync */
 959                 set_bit(In_sync, &rdev->flags);
 960         return 0;
 961 }
 962
 963 /*
 964  * sync_super for 0.90.0
 965  */
 966 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 967 {
 968         mdp_super_t *sb;
 969         mdk_rdev_t *rdev2;
 970         int next_spare = mddev->raid_disks;
 971
 972
 973         /* make rdev->sb match mddev data..
 974          *
 975          * 1/ zero out disks
 976          * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
 977          * 3/ any empty disks < next_spare become removed
 978          *
 979          * disks[0] gets initialised to REMOVED because
 980          * we cannot be sure from other fields if it has
 981          * been initialised or not.
 982          */
 983         int i;
 984         int active=0, working=0,failed=0,spare=0,nr_disks=0;
 985
 986         rdev->sb_size = MD_SB_BYTES;
 987
 988         sb = (mdp_super_t*)page_address(rdev->sb_page);
 989
 990         memset(sb, 0, sizeof(*sb));
 991
 992         sb->md_magic = MD_SB_MAGIC;
 993         sb->major_version = mddev->major_version;
 994         sb->patch_version = mddev->patch_version;
 995         sb->gvalid_words  = 0; /* ignored */
 996         memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
 997         memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
 998         memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
 999         memcpy(&sb->set_uuid3, mddev->uuid+12,4);
1000
1001         sb->ctime = mddev->ctime;
1002         sb->level = mddev->level;
1003         sb->size = mddev->dev_sectors / 2;
1004         sb->raid_disks = mddev->raid_disks;
1005         sb->md_minor = mddev->md_minor;
1006         sb->not_persistent = 0;
1007         sb->utime = mddev->utime;
1008         sb->state = 0;
1009         sb->events_hi = (mddev->events>>32);
1010         sb->events_lo = (u32)mddev->events;
1011
1012         if (mddev->reshape_position == MaxSector)
1013                 sb->minor_version = 90;
1014         else {
1015                 sb->minor_version = 91;
1016                 sb->reshape_position = mddev->reshape_position;
1017                 sb->new_level = mddev->new_level;
1018                 sb->delta_disks = mddev->delta_disks;
1019                 sb->new_layout = mddev->new_layout;
1020                 sb->new_chunk = mddev->new_chunk_sectors << 9;
1021         }
1022         mddev->minor_version = sb->minor_version;
1023         if (mddev->in_sync)
1024         {
1025                 sb->recovery_cp = mddev->recovery_cp;
1026                 sb->cp_events_hi = (mddev->events>>32);
1027                 sb->cp_events_lo = (u32)mddev->events;
1028                 if (mddev->recovery_cp == MaxSector)
1029                         sb->state = (1<< MD_SB_CLEAN);
1030         } else
1031                 sb->recovery_cp = 0;
1032
1033         sb->layout = mddev->layout;
1034         sb->chunk_size = mddev->chunk_sectors << 9;
1035
1036         if (mddev->bitmap && mddev->bitmap_file == NULL)
1037                 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
1038
1039         sb->disks[0].state = (1<<MD_DISK_REMOVED);
1040         list_for_each_entry(rdev2, &mddev->disks, same_set) {
1041                 mdp_disk_t *d;
1042                 int desc_nr;
1043                 int is_active = test_bit(In_sync, &rdev2->flags);
1044
1045                 if (rdev2->raid_disk >= 0 &&
1046                     sb->minor_version >= 91)
1047                         /* we have nowhere to store the recovery_offset,
1048                          * but if it is not below the reshape_position,
1049                          * we can piggy-back on that.
1050                          */
1051                         is_active = 1;
1052                 if (rdev2->raid_disk < 0 ||
1053                     test_bit(Faulty, &rdev2->flags))
1054                         is_active = 0;
1055                 if (is_active)
1056                         desc_nr = rdev2->raid_disk;
1057                 else
1058                         desc_nr = next_spare++;
1059                 rdev2->desc_nr = desc_nr;
1060                 d = &sb->disks[rdev2->desc_nr];
1061                 nr_disks++;
1062                 d->number = rdev2->desc_nr;
1063                 d->major = MAJOR(rdev2->bdev->bd_dev);
1064                 d->minor = MINOR(rdev2->bdev->bd_dev);
1065                 if (is_active)
1066                         d->raid_disk = rdev2->raid_disk;
1067                 else
1068                         d->raid_disk = rdev2->desc_nr; /* compatibility */
1069                 if (test_bit(Faulty, &rdev2->flags))
1070                         d->state = (1<<MD_DISK_FAULTY);
1071                 else if (is_active) {
1072                         d->state = (1<<MD_DISK_ACTIVE);
1073                         if (test_bit(In_sync, &rdev2->flags))
1074                                 d->state |= (1<<MD_DISK_SYNC);
1075                         active++;
1076                         working++;
1077                 } else {
1078                         d->state = 0;
1079                         spare++;
1080                         working++;
1081                 }
1082                 if (test_bit(WriteMostly, &rdev2->flags))
1083                         d->state |= (1<<MD_DISK_WRITEMOSTLY);
1084         }
1085         /* now set the "removed" and "faulty" bits on any missing devices */
1086         for (i=0 ; i < mddev->raid_disks ; i++) {
1087                 mdp_disk_t *d = &sb->disks[i];
1088                 if (d->state == 0 && d->number == 0) {
1089                         d->number = i;
1090                         d->raid_disk = i;
1091                         d->state = (1<<MD_DISK_REMOVED);
1092                         d->state |= (1<<MD_DISK_FAULTY);
1093                         failed++;
1094                 }
1095         }
1096         sb->nr_disks = nr_disks;
1097         sb->active_disks = active;
1098         sb->working_disks = working;
1099         sb->failed_disks = failed;
1100         sb->spare_disks = spare;
1101
1102         sb->this_disk = sb->disks[rdev->desc_nr];
1103         sb->sb_csum = calc_sb_csum(sb);
1104 }
1105
1106 /*
1107  * rdev_size_change for 0.90.0
1108  */
1109 static unsigned long long
1110 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1111 {
1112         if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1113                 return 0; /* component must fit device */
1114         if (rdev->mddev->bitmap_offset)
1115                 return 0; /* can't move bitmap */
1116         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1117         if (!num_sectors || num_sectors > rdev->sb_start)
1118                 num_sectors = rdev->sb_start;
1119         md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1120                        rdev->sb_page);
1121         md_super_wait(rdev->mddev);
1122         return num_sectors / 2; /* kB for sysfs */
1123 }
1124
1125
1126 /*
1127  * version 1 superblock
1128  */
1129
1130 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1131 {
1132         __le32 disk_csum;
1133         u32 csum;
1134         unsigned long long newcsum;
1135         int size = 256 + le32_to_cpu(sb->max_dev)*2;
1136         __le32 *isuper = (__le32*)sb;
1137         int i;
1138
1139         disk_csum = sb->sb_csum;
1140         sb->sb_csum = 0;
1141         newcsum = 0;
1142         for (i=0; size>=4; size -= 4 )
1143                 newcsum += le32_to_cpu(*isuper++);
1144
1145         if (size == 2)
1146                 newcsum += le16_to_cpu(*(__le16*) isuper);
1147
1148         csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1149         sb->sb_csum = disk_csum;
1150         return cpu_to_le32(csum);
1151 }
1152
1153 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1154 {
1155         struct mdp_superblock_1 *sb;
1156         int ret;
1157         sector_t sb_start;
1158         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1159         int bmask;
1160
1161         /*
1162          * Calculate the position of the superblock in 512byte sectors.
1163          * It is always aligned to a 4K boundary and
1164          * depeding on minor_version, it can be:
1165          * 0: At least 8K, but less than 12K, from end of device
1166          * 1: At start of device
1167          * 2: 4K from start of device.
1168          */
1169         switch(minor_version) {
1170         case 0:
1171                 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1172                 sb_start -= 8*2;
1173                 sb_start &= ~(sector_t)(4*2-1);
1174                 break;
1175         case 1:
1176                 sb_start = 0;
1177                 break;
1178         case 2:
1179                 sb_start = 8;
1180                 break;
1181         default:
1182                 return -EINVAL;
1183         }
1184         rdev->sb_start = sb_start;
1185
1186         /* superblock is rarely larger than 1K, but it can be larger,
1187          * and it is safe to read 4k, so we do that
1188          */
1189         ret = read_disk_sb(rdev, 4096);
1190         if (ret) return ret;
1191
1192
1193         sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1194
1195         if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1196             sb->major_version != cpu_to_le32(1) ||
1197             le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1198             le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1199             (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1200                 return -EINVAL;
1201
1202         if (calc_sb_1_csum(sb) != sb->sb_csum) {
1203                 printk("md: invalid superblock checksum on %s\n",
1204                         bdevname(rdev->bdev,b));
1205                 return -EINVAL;
1206         }
1207         if (le64_to_cpu(sb->data_size) < 10) {
1208                 printk("md: data_size too small on %s\n",
1209                        bdevname(rdev->bdev,b));
1210                 return -EINVAL;
1211         }
1212
1213         rdev->preferred_minor = 0xffff;
1214         rdev->data_offset = le64_to_cpu(sb->data_offset);
1215         atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1216
1217         rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1218         bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1219         if (rdev->sb_size & bmask)
1220                 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1221
1222         if (minor_version
1223             && rdev->data_offset < sb_start + (rdev->sb_size/512))
1224                 return -EINVAL;
1225
1226         if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1227                 rdev->desc_nr = -1;
1228         else
1229                 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1230
1231         if (!refdev) {
1232                 ret = 1;
1233         } else {
1234                 __u64 ev1, ev2;
1235                 struct mdp_superblock_1 *refsb =
1236                         (struct mdp_superblock_1*)page_address(refdev->sb_page);
1237
1238                 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1239                     sb->level != refsb->level ||
1240                     sb->layout != refsb->layout ||
1241                     sb->chunksize != refsb->chunksize) {
1242                         printk(KERN_WARNING "md: %s has strangely different"
1243                                 " superblock to %s\n",
1244                                 bdevname(rdev->bdev,b),
1245                                 bdevname(refdev->bdev,b2));
1246                         return -EINVAL;
1247                 }
1248                 ev1 = le64_to_cpu(sb->events);
1249                 ev2 = le64_to_cpu(refsb->events);
1250
1251                 if (ev1 > ev2)
1252                         ret = 1;
1253                 else
1254                         ret = 0;
1255         }
1256         if (minor_version)
1257                 rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
1258                         le64_to_cpu(sb->data_offset);
1259         else
1260                 rdev->sectors = rdev->sb_start;
1261         if (rdev->sectors < le64_to_cpu(sb->data_size))
1262                 return -EINVAL;
1263         rdev->sectors = le64_to_cpu(sb->data_size);
1264         if (le64_to_cpu(sb->size) > rdev->sectors)
1265                 return -EINVAL;
1266         return ret;
1267 }
1268
1269 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1270 {
1271         struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1272         __u64 ev1 = le64_to_cpu(sb->events);
1273
1274         rdev->raid_disk = -1;
1275         clear_bit(Faulty, &rdev->flags);
1276         clear_bit(In_sync, &rdev->flags);
1277         clear_bit(WriteMostly, &rdev->flags);
1278         clear_bit(BarriersNotsupp, &rdev->flags);
1279
1280         if (mddev->raid_disks == 0) {
1281                 mddev->major_version = 1;
1282                 mddev->patch_version = 0;
1283                 mddev->external = 0;
1284                 mddev->chunk_sectors = le32_to_cpu(sb->chunksize);
1285                 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1286                 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1287                 mddev->level = le32_to_cpu(sb->level);
1288                 mddev->clevel[0] = 0;
1289                 mddev->layout = le32_to_cpu(sb->layout);
1290                 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1291                 mddev->dev_sectors = le64_to_cpu(sb->size);
1292                 mddev->events = ev1;
1293                 mddev->bitmap_offset = 0;
1294                 mddev->default_bitmap_offset = 1024 >> 9;
1295
1296                 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1297                 memcpy(mddev->uuid, sb->set_uuid, 16);
1298
1299                 mddev->max_disks =  (4096-256)/2;
1300
1301                 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1302                     mddev->bitmap_file == NULL )
1303                         mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1304
1305                 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1306                         mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1307                         mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1308                         mddev->new_level = le32_to_cpu(sb->new_level);
1309                         mddev->new_layout = le32_to_cpu(sb->new_layout);
1310                         mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk);
1311                 } else {
1312                         mddev->reshape_position = MaxSector;
1313                         mddev->delta_disks = 0;
1314                         mddev->new_level = mddev->level;
1315                         mddev->new_layout = mddev->layout;
1316                         mddev->new_chunk_sectors = mddev->chunk_sectors;
1317                 }
1318
1319         } else if (mddev->pers == NULL) {
1320                 /* Insist of good event counter while assembling */
1321                 ++ev1;
1322                 if (ev1 < mddev->events)
1323                         return -EINVAL;
1324         } else if (mddev->bitmap) {
1325                 /* If adding to array with a bitmap, then we can accept an
1326                  * older device, but not too old.
1327                  */
1328                 if (ev1 < mddev->bitmap->events_cleared)
1329                         return 0;
1330         } else {
1331                 if (ev1 < mddev->events)
1332                         /* just a hot-add of a new device, leave raid_disk at -1 */
1333                         return 0;
1334         }
1335         if (mddev->level != LEVEL_MULTIPATH) {
1336                 int role;
1337                 if (rdev->desc_nr < 0 ||
1338                     rdev->desc_nr >= le32_to_cpu(sb->max_dev)) {
1339                         role = 0xffff;
1340                         rdev->desc_nr = -1;
1341                 } else
1342                         role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1343                 switch(role) {
1344                 case 0xffff: /* spare */
1345                         break;
1346                 case 0xfffe: /* faulty */
1347                         set_bit(Faulty, &rdev->flags);
1348                         break;
1349                 default:
1350                         if ((le32_to_cpu(sb->feature_map) &
1351                              MD_FEATURE_RECOVERY_OFFSET))
1352                                 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1353                         else
1354                                 set_bit(In_sync, &rdev->flags);
1355                         rdev->raid_disk = role;
1356                         break;
1357                 }
1358                 if (sb->devflags & WriteMostly1)
1359                         set_bit(WriteMostly, &rdev->flags);
1360         } else /* MULTIPATH are always insync */
1361                 set_bit(In_sync, &rdev->flags);
1362
1363         return 0;
1364 }
1365
1366 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1367 {
1368         struct mdp_superblock_1 *sb;
1369         mdk_rdev_t *rdev2;
1370         int max_dev, i;
1371         /* make rdev->sb match mddev and rdev data. */
1372
1373         sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1374
1375         sb->feature_map = 0;
1376         sb->pad0 = 0;
1377         sb->recovery_offset = cpu_to_le64(0);
1378         memset(sb->pad1, 0, sizeof(sb->pad1));
1379         memset(sb->pad2, 0, sizeof(sb->pad2));
1380         memset(sb->pad3, 0, sizeof(sb->pad3));
1381
1382         sb->utime = cpu_to_le64((__u64)mddev->utime);
1383         sb->events = cpu_to_le64(mddev->events);
1384         if (mddev->in_sync)
1385                 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1386         else
1387                 sb->resync_offset = cpu_to_le64(0);
1388
1389         sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1390
1391         sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1392         sb->size = cpu_to_le64(mddev->dev_sectors);
1393         sb->chunksize = cpu_to_le32(mddev->chunk_sectors);
1394         sb->level = cpu_to_le32(mddev->level);
1395         sb->layout = cpu_to_le32(mddev->layout);
1396
1397         if (mddev->bitmap && mddev->bitmap_file == NULL) {
1398                 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1399                 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1400         }
1401
1402         if (rdev->raid_disk >= 0 &&
1403             !test_bit(In_sync, &rdev->flags)) {
1404                 if (rdev->recovery_offset > 0) {
1405                         sb->feature_map |=
1406                                 cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1407                         sb->recovery_offset =
1408                                 cpu_to_le64(rdev->recovery_offset);
1409                 }
1410         }
1411
1412         if (mddev->reshape_position != MaxSector) {
1413                 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1414                 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1415                 sb->new_layout = cpu_to_le32(mddev->new_layout);
1416                 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1417                 sb->new_level = cpu_to_le32(mddev->new_level);
1418                 sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
1419         }
1420
1421         max_dev = 0;
1422         list_for_each_entry(rdev2, &mddev->disks, same_set)
1423                 if (rdev2->desc_nr+1 > max_dev)
1424                         max_dev = rdev2->desc_nr+1;
1425
1426         if (max_dev > le32_to_cpu(sb->max_dev)) {
1427                 int bmask;
1428                 sb->max_dev = cpu_to_le32(max_dev);
1429                 rdev->sb_size = max_dev * 2 + 256;
1430                 bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1;
1431                 if (rdev->sb_size & bmask)
1432                         rdev->sb_size = (rdev->sb_size | bmask) + 1;
1433         }
1434         for (i=0; i<max_dev;i++)
1435                 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1436
1437         list_for_each_entry(rdev2, &mddev->disks, same_set) {
1438                 i = rdev2->desc_nr;
1439                 if (test_bit(Faulty, &rdev2->flags))
1440                         sb->dev_roles[i] = cpu_to_le16(0xfffe);
1441                 else if (test_bit(In_sync, &rdev2->flags))
1442                         sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1443                 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1444                         sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1445                 else
1446                         sb->dev_roles[i] = cpu_to_le16(0xffff);
1447         }
1448
1449         sb->sb_csum = calc_sb_1_csum(sb);
1450 }
1451
1452 static unsigned long long
1453 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1454 {
1455         struct mdp_superblock_1 *sb;
1456         sector_t max_sectors;
1457         if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
1458                 return 0; /* component must fit device */
1459         if (rdev->sb_start < rdev->data_offset) {
1460                 /* minor versions 1 and 2; superblock before data */
1461                 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1462                 max_sectors -= rdev->data_offset;
1463                 if (!num_sectors || num_sectors > max_sectors)
1464                         num_sectors = max_sectors;
1465         } else if (rdev->mddev->bitmap_offset) {
1466                 /* minor version 0 with bitmap we can't move */
1467                 return 0;
1468         } else {
1469                 /* minor version 0; superblock after data */
1470                 sector_t sb_start;
1471                 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1472                 sb_start &= ~(sector_t)(4*2 - 1);
1473                 max_sectors = rdev->sectors + sb_start - rdev->sb_start;
1474                 if (!num_sectors || num_sectors > max_sectors)
1475                         num_sectors = max_sectors;
1476                 rdev->sb_start = sb_start;
1477         }
1478         sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1479         sb->data_size = cpu_to_le64(num_sectors);
1480         sb->super_offset = rdev->sb_start;
1481         sb->sb_csum = calc_sb_1_csum(sb);
1482         md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1483                        rdev->sb_page);
1484         md_super_wait(rdev->mddev);
1485         return num_sectors / 2; /* kB for sysfs */
1486 }
1487
1488 static struct super_type super_types[] = {
1489         [0] = {
1490                 .name   = "0.90.0",
1491                 .owner  = THIS_MODULE,
1492                 .load_super         = super_90_load,
1493                 .validate_super     = super_90_validate,
1494                 .sync_super         = super_90_sync,
1495                 .rdev_size_change   = super_90_rdev_size_change,
1496         },
1497         [1] = {
1498                 .name   = "md-1",
1499                 .owner  = THIS_MODULE,
1500                 .load_super         = super_1_load,
1501                 .validate_super     = super_1_validate,
1502                 .sync_super         = super_1_sync,
1503                 .rdev_size_change   = super_1_rdev_size_change,
1504         },
1505 };
1506
1507 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1508 {
1509         mdk_rdev_t *rdev, *rdev2;
1510
1511         rcu_read_lock();
1512         rdev_for_each_rcu(rdev, mddev1)
1513                 rdev_for_each_rcu(rdev2, mddev2)
1514                         if (rdev->bdev->bd_contains ==
1515                             rdev2->bdev->bd_contains) {
1516                                 rcu_read_unlock();
1517                                 return 1;
1518                         }
1519         rcu_read_unlock();
1520         return 0;
1521 }
1522
1523 static LIST_HEAD(pending_raid_disks);
1524
1525 /*
1526  * Try to register data integrity profile for an mddev
1527  *
1528  * This is called when an array is started and after a disk has been kicked
1529  * from the array. It only succeeds if all working and active component devices
1530  * are integrity capable with matching profiles.
1531  */
1532 int md_integrity_register(mddev_t *mddev)
1533 {
1534         mdk_rdev_t *rdev, *reference = NULL;
1535
1536         if (list_empty(&mddev->disks))
1537                 return 0; /* nothing to do */
1538         if (blk_get_integrity(mddev->gendisk))
1539                 return 0; /* already registered */
1540         list_for_each_entry(rdev, &mddev->disks, same_set) {
1541                 /* skip spares and non-functional disks */
1542                 if (test_bit(Faulty, &rdev->flags))
1543                         continue;
1544                 if (rdev->raid_disk < 0)
1545                         continue;
1546                 /*
1547                  * If at least one rdev is not integrity capable, we can not
1548                  * enable data integrity for the md device.
1549                  */
1550                 if (!bdev_get_integrity(rdev->bdev))
1551                         return -EINVAL;
1552                 if (!reference) {
1553                         /* Use the first rdev as the reference */
1554                         reference = rdev;
1555                         continue;
1556                 }
1557                 /* does this rdev's profile match the reference profile? */
1558                 if (blk_integrity_compare(reference->bdev->bd_disk,
1559                                 rdev->bdev->bd_disk) < 0)
1560                         return -EINVAL;
1561         }
1562         /*
1563          * All component devices are integrity capable and have matching
1564          * profiles, register the common profile for the md device.
1565          */
1566         if (blk_integrity_register(mddev->gendisk,
1567                         bdev_get_integrity(reference->bdev)) != 0) {
1568                 printk(KERN_ERR "md: failed to register integrity for %s\n",
1569                         mdname(mddev));
1570                 return -EINVAL;
1571         }
1572         printk(KERN_NOTICE "md: data integrity on %s enabled\n",
1573                 mdname(mddev));
1574         return 0;
1575 }
1576 EXPORT_SYMBOL(md_integrity_register);
1577
1578 /* Disable data integrity if non-capable/non-matching disk is being added */
1579 void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
1580 {
1581         struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
1582         struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
1583
1584         if (!bi_mddev) /* nothing to do */
1585                 return;
1586         if (rdev->raid_disk < 0) /* skip spares */
1587                 return;
1588         if (bi_rdev && blk_integrity_compare(mddev->gendisk,
1589                                              rdev->bdev->bd_disk) >= 0)
1590                 return;
1591         printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev));
1592         blk_integrity_unregister(mddev->gendisk);
1593 }
1594 EXPORT_SYMBOL(md_integrity_add_rdev);
1595
1596 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1597 {
1598         char b[BDEVNAME_SIZE];
1599         struct kobject *ko;
1600         char *s;
1601         int err;
1602
1603         if (rdev->mddev) {
1604                 MD_BUG();
1605                 return -EINVAL;
1606         }
1607
1608         /* prevent duplicates */
1609         if (find_rdev(mddev, rdev->bdev->bd_dev))
1610                 return -EEXIST;
1611
1612         /* make sure rdev->sectors exceeds mddev->dev_sectors */
1613         if (rdev->sectors && (mddev->dev_sectors == 0 ||
1614                         rdev->sectors < mddev->dev_sectors)) {
1615                 if (mddev->pers) {
1616                         /* Cannot change size, so fail
1617                          * If mddev->level <= 0, then we don't care
1618                          * about aligning sizes (e.g. linear)
1619                          */
1620                         if (mddev->level > 0)
1621                                 return -ENOSPC;
1622                 } else
1623                         mddev->dev_sectors = rdev->sectors;
1624         }
1625
1626         /* Verify rdev->desc_nr is unique.
1627          * If it is -1, assign a free number, else
1628          * check number is not in use
1629          */
1630         if (rdev->desc_nr < 0) {
1631                 int choice = 0;
1632                 if (mddev->pers) choice = mddev->raid_disks;
1633                 while (find_rdev_nr(mddev, choice))
1634                         choice++;
1635                 rdev->desc_nr = choice;
1636         } else {
1637                 if (find_rdev_nr(mddev, rdev->desc_nr))
1638                         return -EBUSY;
1639         }
1640         if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) {
1641                 printk(KERN_WARNING "md: %s: array is limited to %d devices\n",
1642                        mdname(mddev), mddev->max_disks);
1643                 return -EBUSY;
1644         }
1645         bdevname(rdev->bdev,b);
1646         while ( (s=strchr(b, '/')) != NULL)
1647                 *s = '!';
1648
1649         rdev->mddev = mddev;
1650         printk(KERN_INFO "md: bind<%s>\n", b);
1651
1652         if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1653                 goto fail;
1654
1655         ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1656         if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1657                 kobject_del(&rdev->kobj);
1658                 goto fail;
1659         }
1660         rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1661
1662         list_add_rcu(&rdev->same_set, &mddev->disks);
1663         bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1664
1665         /* May as well allow recovery to be retried once */
1666         mddev->recovery_disabled = 0;
1667
1668         return 0;
1669
1670  fail:
1671         printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1672                b, mdname(mddev));
1673         return err;
1674 }
1675
1676 static void md_delayed_delete(struct work_struct *ws)
1677 {
1678         mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1679         kobject_del(&rdev->kobj);
1680         kobject_put(&rdev->kobj);
1681 }
1682
1683 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1684 {
1685         char b[BDEVNAME_SIZE];
1686         if (!rdev->mddev) {
1687                 MD_BUG();
1688                 return;
1689         }
1690         bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1691         list_del_rcu(&rdev->same_set);
1692         printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1693         rdev->mddev = NULL;
1694         sysfs_remove_link(&rdev->kobj, "block");
1695         sysfs_put(rdev->sysfs_state);
1696         rdev->sysfs_state = NULL;
1697         /* We need to delay this, otherwise we can deadlock when
1698          * writing to 'remove' to "dev/state".  We also need
1699          * to delay it due to rcu usage.
1700          */
1701         synchronize_rcu();
1702         INIT_WORK(&rdev->del_work, md_delayed_delete);
1703         kobject_get(&rdev->kobj);
1704         schedule_work(&rdev->del_work);
1705 }
1706
1707 /*
1708  * prevent the device from being mounted, repartitioned or
1709  * otherwise reused by a RAID array (or any other kernel
1710  * subsystem), by bd_claiming the device.
1711  */
1712 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1713 {
1714         int err = 0;
1715         struct block_device *bdev;
1716         char b[BDEVNAME_SIZE];
1717
1718         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1719         if (IS_ERR(bdev)) {
1720                 printk(KERN_ERR "md: could not open %s.\n",
1721                         __bdevname(dev, b));
1722                 return PTR_ERR(bdev);
1723         }
1724         err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1725         if (err) {
1726                 printk(KERN_ERR "md: could not bd_claim %s.\n",
1727                         bdevname(bdev, b));
1728                 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1729                 return err;
1730         }
1731         if (!shared)
1732                 set_bit(AllReserved, &rdev->flags);
1733         rdev->bdev = bdev;
1734         return err;
1735 }
1736
1737 static void unlock_rdev(mdk_rdev_t *rdev)
1738 {
1739         struct block_device *bdev = rdev->bdev;
1740         rdev->bdev = NULL;
1741         if (!bdev)
1742                 MD_BUG();
1743         bd_release(bdev);
1744         blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1745 }
1746
1747 void md_autodetect_dev(dev_t dev);
1748
1749 static void export_rdev(mdk_rdev_t * rdev)
1750 {
1751         char b[BDEVNAME_SIZE];
1752         printk(KERN_INFO "md: export_rdev(%s)\n",
1753                 bdevname(rdev->bdev,b));
1754         if (rdev->mddev)
1755                 MD_BUG();
1756         free_disk_sb(rdev);
1757 #ifndef MODULE
1758         if (test_bit(AutoDetected, &rdev->flags))
1759                 md_autodetect_dev(rdev->bdev->bd_dev);
1760 #endif
1761         unlock_rdev(rdev);
1762         kobject_put(&rdev->kobj);
1763 }
1764
1765 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1766 {
1767         unbind_rdev_from_array(rdev);
1768         export_rdev(rdev);
1769 }
1770
1771 static void export_array(mddev_t *mddev)
1772 {
1773         mdk_rdev_t *rdev, *tmp;
1774
1775         rdev_for_each(rdev, tmp, mddev) {
1776                 if (!rdev->mddev) {
1777                         MD_BUG();
1778                         continue;
1779                 }
1780                 kick_rdev_from_array(rdev);
1781         }
1782         if (!list_empty(&mddev->disks))
1783                 MD_BUG();
1784         mddev->raid_disks = 0;
1785         mddev->major_version = 0;
1786 }
1787
1788 static void print_desc(mdp_disk_t *desc)
1789 {
1790         printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1791                 desc->major,desc->minor,desc->raid_disk,desc->state);
1792 }
1793
1794 static void print_sb_90(mdp_super_t *sb)
1795 {
1796         int i;
1797
1798         printk(KERN_INFO
1799                 "md:  SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1800                 sb->major_version, sb->minor_version, sb->patch_version,
1801                 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1802                 sb->ctime);
1803         printk(KERN_INFO "md:     L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1804                 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1805                 sb->md_minor, sb->layout, sb->chunk_size);
1806         printk(KERN_INFO "md:     UT:%08x ST:%d AD:%d WD:%d"
1807                 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1808                 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1809                 sb->failed_disks, sb->spare_disks,
1810                 sb->sb_csum, (unsigned long)sb->events_lo);
1811
1812         printk(KERN_INFO);
1813         for (i = 0; i < MD_SB_DISKS; i++) {
1814                 mdp_disk_t *desc;
1815
1816                 desc = sb->disks + i;
1817                 if (desc->number || desc->major || desc->minor ||
1818                     desc->raid_disk || (desc->state && (desc->state != 4))) {
1819                         printk("     D %2d: ", i);
1820                         print_desc(desc);
1821                 }
1822         }
1823         printk(KERN_INFO "md:     THIS: ");
1824         print_desc(&sb->this_disk);
1825 }
1826
1827 static void print_sb_1(struct mdp_superblock_1 *sb)
1828 {
1829         __u8 *uuid;
1830
1831         uuid = sb->set_uuid;
1832         printk(KERN_INFO
1833                "md:  SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1834                ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1835                "md:    Name: \"%s\" CT:%llu\n",
1836                 le32_to_cpu(sb->major_version),
1837                 le32_to_cpu(sb->feature_map),
1838                 uuid[0], uuid[1], uuid[2], uuid[3],
1839                 uuid[4], uuid[5], uuid[6], uuid[7],
1840                 uuid[8], uuid[9], uuid[10], uuid[11],
1841                 uuid[12], uuid[13], uuid[14], uuid[15],
1842                 sb->set_name,
1843                 (unsigned long long)le64_to_cpu(sb->ctime)
1844                        & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1845
1846         uuid = sb->device_uuid;
1847         printk(KERN_INFO
1848                "md:       L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1849                         " RO:%llu\n"
1850                "md:     Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1851                         ":%02x%02x%02x%02x%02x%02x\n"
1852                "md:       (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1853                "md:         (MaxDev:%u) \n",
1854                 le32_to_cpu(sb->level),
1855                 (unsigned long long)le64_to_cpu(sb->size),
1856                 le32_to_cpu(sb->raid_disks),
1857                 le32_to_cpu(sb->layout),
1858                 le32_to_cpu(sb->chunksize),
1859                 (unsigned long long)le64_to_cpu(sb->data_offset),
1860                 (unsigned long long)le64_to_cpu(sb->data_size),
1861                 (unsigned long long)le64_to_cpu(sb->super_offset),
1862                 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1863                 le32_to_cpu(sb->dev_number),
1864                 uuid[0], uuid[1], uuid[2], uuid[3],
1865                 uuid[4], uuid[5], uuid[6], uuid[7],
1866                 uuid[8], uuid[9], uuid[10], uuid[11],
1867                 uuid[12], uuid[13], uuid[14], uuid[15],
1868                 sb->devflags,
1869                 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1870                 (unsigned long long)le64_to_cpu(sb->events),
1871                 (unsigned long long)le64_to_cpu(sb->resync_offset),
1872                 le32_to_cpu(sb->sb_csum),
1873                 le32_to_cpu(sb->max_dev)
1874                 );
1875 }
1876
1877 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1878 {
1879         char b[BDEVNAME_SIZE];
1880         printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n",
1881                 bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors,
1882                 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1883                 rdev->desc_nr);
1884         if (rdev->sb_loaded) {
1885                 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1886                 switch (major_version) {
1887                 case 0:
1888                         print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1889                         break;
1890                 case 1:
1891                         print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1892                         break;
1893                 }
1894         } else
1895                 printk(KERN_INFO "md: no rdev superblock!\n");
1896 }
1897
1898 static void md_print_devices(void)
1899 {
1900         struct list_head *tmp;
1901         mdk_rdev_t *rdev;
1902         mddev_t *mddev;
1903         char b[BDEVNAME_SIZE];
1904
1905         printk("\n");
1906         printk("md:     **********************************\n");
1907         printk("md:     * <COMPLETE RAID STATE PRINTOUT> *\n");
1908         printk("md:     **********************************\n");
1909         for_each_mddev(mddev, tmp) {
1910
1911                 if (mddev->bitmap)
1912                         bitmap_print_sb(mddev->bitmap);
1913                 else
1914                         printk("%s: ", mdname(mddev));
1915                 list_for_each_entry(rdev, &mddev->disks, same_set)
1916                         printk("<%s>", bdevname(rdev->bdev,b));
1917                 printk("\n");
1918
1919                 list_for_each_entry(rdev, &mddev->disks, same_set)
1920                         print_rdev(rdev, mddev->major_version);
1921         }
1922         printk("md:     **********************************\n");
1923         printk("\n");
1924 }
1925
1926
1927 static void sync_sbs(mddev_t * mddev, int nospares)
1928 {
1929         /* Update each superblock (in-memory image), but
1930          * if we are allowed to, skip spares which already
1931          * have the right event counter, or have one earlier
1932          * (which would mean they aren't being marked as dirty
1933          * with the rest of the array)
1934          */
1935         mdk_rdev_t *rdev;
1936
1937         /* First make sure individual recovery_offsets are correct */
1938         list_for_each_entry(rdev, &mddev->disks, same_set) {
1939                 if (rdev->raid_disk >= 0 &&
1940                     !test_bit(In_sync, &rdev->flags) &&
1941                     mddev->curr_resync_completed > rdev->recovery_offset)
1942                                 rdev->recovery_offset = mddev->curr_resync_completed;
1943
1944         }
1945         list_for_each_entry(rdev, &mddev->disks, same_set) {
1946                 if (rdev->sb_events == mddev->events ||
1947                     (nospares &&
1948                      rdev->raid_disk < 0 &&
1949                      (rdev->sb_events&1)==0 &&
1950                      rdev->sb_events+1 == mddev->events)) {
1951                         /* Don't update this superblock */
1952                         rdev->sb_loaded = 2;
1953                 } else {
1954                         super_types[mddev->major_version].
1955                                 sync_super(mddev, rdev);
1956                         rdev->sb_loaded = 1;
1957                 }
1958         }
1959 }
1960
1961 static void md_update_sb(mddev_t * mddev, int force_change)
1962 {
1963         mdk_rdev_t *rdev;
1964         int sync_req;
1965         int nospares = 0;
1966
1967         mddev->utime = get_seconds();
1968         if (mddev->external)
1969                 return;
1970 repeat:
1971         spin_lock_irq(&mddev->write_lock);
1972
1973         set_bit(MD_CHANGE_PENDING, &mddev->flags);
1974         if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1975                 force_change = 1;
1976         if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1977                 /* just a clean<-> dirty transition, possibly leave spares alone,
1978                  * though if events isn't the right even/odd, we will have to do
1979                  * spares after all
1980                  */
1981                 nospares = 1;
1982         if (force_change)
1983                 nospares = 0;
1984         if (mddev->degraded)
1985                 /* If the array is degraded, then skipping spares is both
1986                  * dangerous and fairly pointless.
1987                  * Dangerous because a device that was removed from the array
1988                  * might have a event_count that still looks up-to-date,
1989                  * so it can be re-added without a resync.
1990                  * Pointless because if there are any spares to skip,
1991                  * then a recovery will happen and soon that array won't
1992                  * be degraded any more and the spare can go back to sleep then.
1993                  */
1994                 nospares = 0;
1995
1996         sync_req = mddev->in_sync;
1997
1998         /* If this is just a dirty<->clean transition, and the array is clean
1999          * and 'events' is odd, we can roll back to the previous clean state */
2000         if (nospares
2001             && (mddev->in_sync && mddev->recovery_cp == MaxSector)
2002             && (mddev->events & 1)
2003             && mddev->events != 1)
2004                 mddev->events--;
2005         else {
2006                 /* otherwise we have to go forward and ... */
2007                 mddev->events ++;
2008                 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
2009                         /* .. if the array isn't clean, an 'even' event must also go
2010                          * to spares. */
2011                         if ((mddev->events&1)==0)
2012                                 nospares = 0;
2013                 } else {
2014                         /* otherwise an 'odd' event must go to spares */
2015                         if ((mddev->events&1))
2016                                 nospares = 0;
2017                 }
2018         }
2019
2020         if (!mddev->events) {
2021                 /*
2022                  * oops, this 64-bit counter should never wrap.
2023                  * Either we are in around ~1 trillion A.C., assuming
2024                  * 1 reboot per second, or we have a bug:
2025                  */
2026                 MD_BUG();
2027                 mddev->events --;
2028         }
2029
2030         /*
2031          * do not write anything to disk if using
2032          * nonpersistent superblocks
2033          */
2034         if (!mddev->persistent) {
2035                 if (!mddev->external)
2036                         clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2037
2038                 spin_unlock_irq(&mddev->write_lock);
2039                 wake_up(&mddev->sb_wait);
2040                 return;
2041         }
2042         sync_sbs(mddev, nospares);
2043         spin_unlock_irq(&mddev->write_lock);
2044
2045         dprintk(KERN_INFO
2046                 "md: updating %s RAID superblock on device (in sync %d)\n",
2047                 mdname(mddev),mddev->in_sync);
2048
2049         bitmap_update_sb(mddev->bitmap);
2050         list_for_each_entry(rdev, &mddev->disks, same_set) {
2051                 char b[BDEVNAME_SIZE];
2052                 dprintk(KERN_INFO "md: ");
2053                 if (rdev->sb_loaded != 1)
2054                         continue; /* no noise on spare devices */
2055                 if (test_bit(Faulty, &rdev->flags))
2056                         dprintk("(skipping faulty ");
2057
2058                 dprintk("%s ", bdevname(rdev->bdev,b));
2059                 if (!test_bit(Faulty, &rdev->flags)) {
2060                         md_super_write(mddev,rdev,
2061                                        rdev->sb_start, rdev->sb_size,
2062                                        rdev->sb_page);
2063                         dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
2064                                 bdevname(rdev->bdev,b),
2065                                 (unsigned long long)rdev->sb_start);
2066                         rdev->sb_events = mddev->events;
2067
2068                 } else
2069                         dprintk(")\n");
2070                 if (mddev->level == LEVEL_MULTIPATH)
2071                         /* only need to write one superblock... */
2072                         break;
2073         }
2074         md_super_wait(mddev);
2075         /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
2076
2077         spin_lock_irq(&mddev->write_lock);
2078         if (mddev->in_sync != sync_req ||
2079             test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
2080                 /* have to write it out again */
2081                 spin_unlock_irq(&mddev->write_lock);
2082                 goto repeat;
2083         }
2084         clear_bit(MD_CHANGE_PENDING, &mddev->flags);
2085         spin_unlock_irq(&mddev->write_lock);
2086         wake_up(&mddev->sb_wait);
2087         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2088                 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
2089
2090 }
2091
2092 /* words written to sysfs files may, or may not, be \n terminated.
2093  * We want to accept with case. For this we use cmd_match.
2094  */
2095 static int cmd_match(const char *cmd, const char *str)
2096 {
2097         /* See if cmd, written into a sysfs file, matches
2098          * str.  They must either be the same, or cmd can
2099          * have a trailing newline
2100          */
2101         while (*cmd && *str && *cmd == *str) {
2102                 cmd++;
2103                 str++;
2104         }
2105         if (*cmd == '\n')
2106                 cmd++;
2107         if (*str || *cmd)
2108                 return 0;
2109         return 1;
2110 }
2111
2112 struct rdev_sysfs_entry {
2113         struct attribute attr;
2114         ssize_t (*show)(mdk_rdev_t *, char *);
2115         ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
2116 };
2117
2118 static ssize_t
2119 state_show(mdk_rdev_t *rdev, char *page)
2120 {
2121         char *sep = "";
2122         size_t len = 0;
2123
2124         if (test_bit(Faulty, &rdev->flags)) {
2125                 len+= sprintf(page+len, "%sfaulty",sep);
2126                 sep = ",";
2127         }
2128         if (test_bit(In_sync, &rdev->flags)) {
2129                 len += sprintf(page+len, "%sin_sync",sep);
2130                 sep = ",";
2131         }
2132         if (test_bit(WriteMostly, &rdev->flags)) {
2133                 len += sprintf(page+len, "%swrite_mostly",sep);
2134                 sep = ",";
2135         }
2136         if (test_bit(Blocked, &rdev->flags)) {
2137                 len += sprintf(page+len, "%sblocked", sep);
2138                 sep = ",";
2139         }
2140         if (!test_bit(Faulty, &rdev->flags) &&
2141             !test_bit(In_sync, &rdev->flags)) {
2142                 len += sprintf(page+len, "%sspare", sep);
2143                 sep = ",";
2144         }
2145         return len+sprintf(page+len, "\n");
2146 }
2147
2148 static ssize_t
2149 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2150 {
2151         /* can write
2152          *  faulty  - simulates and error
2153          *  remove  - disconnects the device
2154          *  writemostly - sets write_mostly
2155          *  -writemostly - clears write_mostly
2156          *  blocked - sets the Blocked flag
2157          *  -blocked - clears the Blocked flag
2158          *  insync - sets Insync providing device isn't active
2159          */
2160         int err = -EINVAL;
2161         if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
2162                 md_error(rdev->mddev, rdev);
2163                 err = 0;
2164         } else if (cmd_match(buf, "remove")) {
2165                 if (rdev->raid_disk >= 0)
2166                         err = -EBUSY;
2167                 else {
2168                         mddev_t *mddev = rdev->mddev;
2169                         kick_rdev_from_array(rdev);
2170                         if (mddev->pers)
2171                                 md_update_sb(mddev, 1);
2172                         md_new_event(mddev);
2173                         err = 0;
2174                 }
2175         } else if (cmd_match(buf, "writemostly")) {
2176                 set_bit(WriteMostly, &rdev->flags);
2177                 err = 0;
2178         } else if (cmd_match(buf, "-writemostly")) {
2179                 clear_bit(WriteMostly, &rdev->flags);
2180                 err = 0;
2181         } else if (cmd_match(buf, "blocked")) {
2182                 set_bit(Blocked, &rdev->flags);
2183                 err = 0;
2184         } else if (cmd_match(buf, "-blocked")) {
2185                 clear_bit(Blocked, &rdev->flags);
2186                 wake_up(&rdev->blocked_wait);
2187                 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2188                 md_wakeup_thread(rdev->mddev->thread);
2189
2190                 err = 0;
2191         } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) {
2192                 set_bit(In_sync, &rdev->flags);
2193                 err = 0;
2194         }
2195         if (!err && rdev->sysfs_state)
2196                 sysfs_notify_dirent(rdev->sysfs_state);
2197         return err ? err : len;
2198 }
2199 static struct rdev_sysfs_entry rdev_state =
2200 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
2201
2202 static ssize_t
2203 errors_show(mdk_rdev_t *rdev, char *page)
2204 {
2205         return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
2206 }
2207
2208 static ssize_t
2209 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2210 {
2211         char *e;
2212         unsigned long n = simple_strtoul(buf, &e, 10);
2213         if (*buf && (*e == 0 || *e == '\n')) {
2214                 atomic_set(&rdev->corrected_errors, n);
2215                 return len;
2216         }
2217         return -EINVAL;
2218 }
2219 static struct rdev_sysfs_entry rdev_errors =
2220 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
2221
2222 static ssize_t
2223 slot_show(mdk_rdev_t *rdev, char *page)
2224 {
2225         if (rdev->raid_disk < 0)
2226                 return sprintf(page, "none\n");
2227         else
2228                 return sprintf(page, "%d\n", rdev->raid_disk);
2229 }
2230
2231 static ssize_t
2232 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2233 {
2234         char *e;
2235         int err;
2236         char nm[20];
2237         int slot = simple_strtoul(buf, &e, 10);
2238         if (strncmp(buf, "none", 4)==0)
2239                 slot = -1;
2240         else if (e==buf || (*e && *e!= '\n'))
2241                 return -EINVAL;
2242         if (rdev->mddev->pers && slot == -1) {
2243                 /* Setting 'slot' on an active array requires also
2244                  * updating the 'rd%d' link, and communicating
2245                  * with the personality with ->hot_*_disk.
2246                  * For now we only support removing
2247                  * failed/spare devices.  This normally happens automatically,
2248                  * but not when the metadata is externally managed.
2249                  */
2250                 if (rdev->raid_disk == -1)
2251                         return -EEXIST;
2252                 /* personality does all needed checks */
2253                 if (rdev->mddev->pers->hot_add_disk == NULL)
2254                         return -EINVAL;
2255                 err = rdev->mddev->pers->
2256                         hot_remove_disk(rdev->mddev, rdev->raid_disk);
2257                 if (err)
2258                         return err;
2259                 sprintf(nm, "rd%d", rdev->raid_disk);
2260                 sysfs_remove_link(&rdev->mddev->kobj, nm);
2261                 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2262                 md_wakeup_thread(rdev->mddev->thread);
2263         } else if (rdev->mddev->pers) {
2264                 mdk_rdev_t *rdev2;
2265                 /* Activating a spare .. or possibly reactivating
2266                  * if we ever get bitmaps working here.
2267                  */
2268
2269                 if (rdev->raid_disk != -1)
2270                         return -EBUSY;
2271
2272                 if (rdev->mddev->pers->hot_add_disk == NULL)
2273                         return -EINVAL;
2274
2275                 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2276                         if (rdev2->raid_disk == slot)
2277                                 return -EEXIST;
2278
2279                 rdev->raid_disk = slot;
2280                 if (test_bit(In_sync, &rdev->flags))
2281                         rdev->saved_raid_disk = slot;
2282                 else
2283                         rdev->saved_raid_disk = -1;
2284                 err = rdev->mddev->pers->
2285                         hot_add_disk(rdev->mddev, rdev);
2286                 if (err) {
2287                         rdev->raid_disk = -1;
2288                         return err;
2289                 } else
2290                         sysfs_notify_dirent(rdev->sysfs_state);
2291                 sprintf(nm, "rd%d", rdev->raid_disk);
2292                 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2293                         printk(KERN_WARNING
2294                                "md: cannot register "
2295                                "%s for %s\n",
2296                                nm, mdname(rdev->mddev));
2297
2298                 /* don't wakeup anyone, leave that to userspace. */
2299         } else {
2300                 if (slot >= rdev->mddev->raid_disks)
2301                         return -ENOSPC;
2302                 rdev->raid_disk = slot;
2303                 /* assume it is working */
2304                 clear_bit(Faulty, &rdev->flags);
2305                 clear_bit(WriteMostly, &rdev->flags);
2306                 set_bit(In_sync, &rdev->flags);
2307                 sysfs_notify_dirent(rdev->sysfs_state);
2308         }
2309         return len;
2310 }
2311
2312
2313 static struct rdev_sysfs_entry rdev_slot =
2314 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2315
2316 static ssize_t
2317 offset_show(mdk_rdev_t *rdev, char *page)
2318 {
2319         return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2320 }
2321
2322 static ssize_t
2323 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2324 {
2325         char *e;
2326         unsigned long long offset = simple_strtoull(buf, &e, 10);
2327         if (e==buf || (*e && *e != '\n'))
2328                 return -EINVAL;
2329         if (rdev->mddev->pers && rdev->raid_disk >= 0)
2330                 return -EBUSY;
2331         if (rdev->sectors && rdev->mddev->external)
2332                 /* Must set offset before size, so overlap checks
2333                  * can be sane */
2334                 return -EBUSY;
2335         rdev->data_offset = offset;
2336         return len;
2337 }
2338
2339 static struct rdev_sysfs_entry rdev_offset =
2340 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2341
2342 static ssize_t
2343 rdev_size_show(mdk_rdev_t *rdev, char *page)
2344 {
2345         return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2);
2346 }
2347
2348 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2349 {
2350         /* check if two start/length pairs overlap */
2351         if (s1+l1 <= s2)
2352                 return 0;
2353         if (s2+l2 <= s1)
2354                 return 0;
2355         return 1;
2356 }
2357
2358 static int strict_blocks_to_sectors(const char *buf, sector_t *sectors)
2359 {
2360         unsigned long long blocks;
2361         sector_t new;
2362
2363         if (strict_strtoull(buf, 10, &blocks) < 0)
2364                 return -EINVAL;
2365
2366         if (blocks & 1ULL << (8 * sizeof(blocks) - 1))
2367                 return -EINVAL; /* sector conversion overflow */
2368
2369         new = blocks * 2;
2370         if (new != blocks * 2)
2371                 return -EINVAL; /* unsigned long long to sector_t overflow */
2372
2373         *sectors = new;
2374         return 0;
2375 }
2376
2377 static ssize_t
2378 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2379 {
2380         mddev_t *my_mddev = rdev->mddev;
2381         sector_t oldsectors = rdev->sectors;
2382         sector_t sectors;
2383
2384         if (strict_blocks_to_sectors(buf, &sectors) < 0)
2385                 return -EINVAL;
2386         if (my_mddev->pers && rdev->raid_disk >= 0) {
2387                 if (my_mddev->persistent) {
2388                         sectors = super_types[my_mddev->major_version].
2389                                 rdev_size_change(rdev, sectors);
2390                         if (!sectors)
2391                                 return -EBUSY;
2392                 } else if (!sectors)
2393                         sectors = (rdev->bdev->bd_inode->i_size >> 9) -
2394                                 rdev->data_offset;
2395         }
2396         if (sectors < my_mddev->dev_sectors)
2397                 return -EINVAL; /* component must fit device */
2398
2399         rdev->sectors = sectors;
2400         if (sectors > oldsectors && my_mddev->external) {
2401                 /* need to check that all other rdevs with the same ->bdev
2402                  * do not overlap.  We need to unlock the mddev to avoid
2403                  * a deadlock.  We have already changed rdev->sectors, and if
2404                  * we have to change it back, we will have the lock again.
2405                  */
2406                 mddev_t *mddev;
2407                 int overlap = 0;
2408                 struct list_head *tmp;
2409
2410                 mddev_unlock(my_mddev);
2411                 for_each_mddev(mddev, tmp) {
2412                         mdk_rdev_t *rdev2;
2413
2414                         mddev_lock(mddev);
2415                         list_for_each_entry(rdev2, &mddev->disks, same_set)
2416                                 if (test_bit(AllReserved, &rdev2->flags) ||
2417                                     (rdev->bdev == rdev2->bdev &&
2418                                      rdev != rdev2 &&
2419                                      overlaps(rdev->data_offset, rdev->sectors,
2420                                               rdev2->data_offset,
2421                                               rdev2->sectors))) {
2422                                         overlap = 1;
2423                                         break;
2424                                 }
2425                         mddev_unlock(mddev);
2426                         if (overlap) {
2427                                 mddev_put(mddev);
2428                                 break;
2429                         }
2430                 }
2431                 mddev_lock(my_mddev);
2432                 if (overlap) {
2433                         /* Someone else could have slipped in a size
2434                          * change here, but doing so is just silly.
2435                          * We put oldsectors back because we *know* it is
2436                          * safe, and trust userspace not to race with
2437                          * itself
2438                          */
2439                         rdev->sectors = oldsectors;
2440                         return -EBUSY;
2441                 }
2442         }
2443         return len;
2444 }
2445
2446 static struct rdev_sysfs_entry rdev_size =
2447 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2448
2449 static struct attribute *rdev_default_attrs[] = {
2450         &rdev_state.attr,
2451         &rdev_errors.attr,
2452         &rdev_slot.attr,
2453         &rdev_offset.attr,
2454         &rdev_size.attr,
2455         NULL,
2456 };
2457 static ssize_t
2458 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2459 {
2460         struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2461         mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2462         mddev_t *mddev = rdev->mddev;
2463         ssize_t rv;
2464
2465         if (!entry->show)
2466                 return -EIO;
2467
2468         rv = mddev ? mddev_lock(mddev) : -EBUSY;
2469         if (!rv) {
2470                 if (rdev->mddev == NULL)
2471                         rv = -EBUSY;
2472                 else
2473                         rv = entry->show(rdev, page);
2474                 mddev_unlock(mddev);
2475         }
2476         return rv;
2477 }
2478
2479 static ssize_t
2480 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2481               const char *page, size_t length)
2482 {
2483         struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2484         mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2485         ssize_t rv;
2486         mddev_t *mddev = rdev->mddev;
2487
2488         if (!entry->store)
2489                 return -EIO;
2490         if (!capable(CAP_SYS_ADMIN))
2491                 return -EACCES;
2492         rv = mddev ? mddev_lock(mddev): -EBUSY;
2493         if (!rv) {
2494                 if (rdev->mddev == NULL)
2495                         rv = -EBUSY;
2496                 else
2497                         rv = entry->store(rdev, page, length);
2498                 mddev_unlock(mddev);
2499         }
2500         return rv;
2501 }
2502
2503 static void rdev_free(struct kobject *ko)
2504 {
2505         mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2506         kfree(rdev);
2507 }
2508 static struct sysfs_ops rdev_sysfs_ops = {
2509         .show           = rdev_attr_show,
2510         .store          = rdev_attr_store,
2511 };
2512 static struct kobj_type rdev_ktype = {
2513         .release        = rdev_free,
2514         .sysfs_ops      = &rdev_sysfs_ops,
2515         .default_attrs  = rdev_default_attrs,
2516 };
2517
2518 /*
2519  * Import a device. If 'super_format' >= 0, then sanity check the superblock
2520  *
2521  * mark the device faulty if:
2522  *
2523  *   - the device is nonexistent (zero size)
2524  *   - the device has no valid superblock
2525  *
2526  * a faulty rdev _never_ has rdev->sb set.
2527  */
2528 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2529 {
2530         char b[BDEVNAME_SIZE];
2531         int err;
2532         mdk_rdev_t *rdev;
2533         sector_t size;
2534
2535         rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2536         if (!rdev) {
2537                 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2538                 return ERR_PTR(-ENOMEM);
2539         }
2540
2541         if ((err = alloc_disk_sb(rdev)))
2542                 goto abort_free;
2543
2544         err = lock_rdev(rdev, newdev, super_format == -2);
2545         if (err)
2546                 goto abort_free;
2547
2548         kobject_init(&rdev->kobj, &rdev_ktype);
2549
2550         rdev->desc_nr = -1;
2551         rdev->saved_raid_disk = -1;
2552         rdev->raid_disk = -1;
2553         rdev->flags = 0;
2554         rdev->data_offset = 0;
2555         rdev->sb_events = 0;
2556         atomic_set(&rdev->nr_pending, 0);
2557         atomic_set(&rdev->read_errors, 0);
2558         atomic_set(&rdev->corrected_errors, 0);
2559
2560         size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2561         if (!size) {
2562                 printk(KERN_WARNING
2563                         "md: %s has zero or unknown size, marking faulty!\n",
2564                         bdevname(rdev->bdev,b));
2565                 err = -EINVAL;
2566                 goto abort_free;
2567         }
2568
2569         if (super_format >= 0) {
2570                 err = super_types[super_format].
2571                         load_super(rdev, NULL, super_minor);
2572                 if (err == -EINVAL) {
2573                         printk(KERN_WARNING
2574                                 "md: %s does not have a valid v%d.%d "
2575                                "superblock, not importing!\n",
2576                                 bdevname(rdev->bdev,b),
2577                                super_format, super_minor);
2578                         goto abort_free;
2579                 }
2580                 if (err < 0) {
2581                         printk(KERN_WARNING
2582                                 "md: could not read %s's sb, not importing!\n",
2583                                 bdevname(rdev->bdev,b));
2584                         goto abort_free;
2585                 }
2586         }
2587
2588         INIT_LIST_HEAD(&rdev->same_set);
2589         init_waitqueue_head(&rdev->blocked_wait);
2590
2591         return rdev;
2592
2593 abort_free:
2594         if (rdev->sb_page) {
2595                 if (rdev->bdev)
2596                         unlock_rdev(rdev);
2597                 free_disk_sb(rdev);
2598         }
2599         kfree(rdev);
2600         return ERR_PTR(err);
2601 }
2602
2603 /*
2604  * Check a full RAID array for plausibility
2605  */
2606
2607
2608 static void analyze_sbs(mddev_t * mddev)
2609 {
2610         int i;
2611         mdk_rdev_t *rdev, *freshest, *tmp;
2612         char b[BDEVNAME_SIZE];
2613
2614         freshest = NULL;
2615         rdev_for_each(rdev, tmp, mddev)
2616                 switch (super_types[mddev->major_version].
2617                         load_super(rdev, freshest, mddev->minor_version)) {
2618                 case 1:
2619                         freshest = rdev;
2620                         break;
2621                 case 0:
2622                         break;
2623                 default:
2624                         printk( KERN_ERR \
2625                                 "md: fatal superblock inconsistency in %s"
2626                                 " -- removing from array\n",
2627                                 bdevname(rdev->bdev,b));
2628                         kick_rdev_from_array(rdev);
2629                 }
2630
2631
2632         super_types[mddev->major_version].
2633                 validate_super(mddev, freshest);
2634
2635         i = 0;
2636         rdev_for_each(rdev, tmp, mddev) {
2637                 if (rdev->desc_nr >= mddev->max_disks ||
2638                     i > mddev->max_disks) {
2639                         printk(KERN_WARNING
2640                                "md: %s: %s: only %d devices permitted\n",
2641                                mdname(mddev), bdevname(rdev->bdev, b),
2642                                mddev->max_disks);
2643                         kick_rdev_from_array(rdev);
2644                         continue;
2645                 }
2646                 if (rdev != freshest)
2647                         if (super_types[mddev->major_version].
2648                             validate_super(mddev, rdev)) {
2649                                 printk(KERN_WARNING "md: kicking non-fresh %s"
2650                                         " from array!\n",
2651                                         bdevname(rdev->bdev,b));
2652                                 kick_rdev_from_array(rdev);
2653                                 continue;
2654                         }
2655                 if (mddev->level == LEVEL_MULTIPATH) {
2656                         rdev->desc_nr = i++;
2657                         rdev->raid_disk = rdev->desc_nr;
2658                         set_bit(In_sync, &rdev->flags);
2659                 } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
2660                         rdev->raid_disk = -1;
2661                         clear_bit(In_sync, &rdev->flags);
2662                 }
2663         }
2664 }
2665
2666 static void md_safemode_timeout(unsigned long data);
2667
2668 static ssize_t
2669 safe_delay_show(mddev_t *mddev, char *page)
2670 {
2671         int msec = (mddev->safemode_delay*1000)/HZ;
2672         return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2673 }
2674 static ssize_t
2675 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2676 {
2677         int scale=1;
2678         int dot=0;
2679         int i;
2680         unsigned long msec;
2681         char buf[30];
2682
2683         /* remove a period, and count digits after it */
2684         if (len >= sizeof(buf))
2685                 return -EINVAL;
2686         strlcpy(buf, cbuf, sizeof(buf));
2687         for (i=0; i<len; i++) {
2688                 if (dot) {
2689                         if (isdigit(buf[i])) {
2690                                 buf[i-1] = buf[i];
2691                                 scale *= 10;
2692                         }
2693                         buf[i] = 0;
2694                 } else if (buf[i] == '.') {
2695                         dot=1;
2696                         buf[i] = 0;
2697                 }
2698         }
2699         if (strict_strtoul(buf, 10, &msec) < 0)
2700                 return -EINVAL;
2701         msec = (msec * 1000) / scale;
2702         if (msec == 0)
2703                 mddev->safemode_delay = 0;
2704         else {
2705                 unsigned long old_delay = mddev->safemode_delay;
2706                 mddev->safemode_delay = (msec*HZ)/1000;
2707                 if (mddev->safemode_delay == 0)
2708                         mddev->safemode_delay = 1;
2709                 if (mddev->safemode_delay < old_delay)
2710                         md_safemode_timeout((unsigned long)mddev);
2711         }
2712         return len;
2713 }
2714 static struct md_sysfs_entry md_safe_delay =
2715 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2716
2717 static ssize_t
2718 level_show(mddev_t *mddev, char *page)
2719 {
2720         struct mdk_personality *p = mddev->pers;
2721         if (p)
2722                 return sprintf(page, "%s\n", p->name);
2723         else if (mddev->clevel[0])
2724                 return sprintf(page, "%s\n", mddev->clevel);
2725         else if (mddev->level != LEVEL_NONE)
2726                 return sprintf(page, "%d\n", mddev->level);
2727         else
2728                 return 0;
2729 }
2730
2731 static ssize_t
2732 level_store(mddev_t *mddev, const char *buf, size_t len)
2733 {
2734         char level[16];
2735         ssize_t rv = len;
2736         struct mdk_personality *pers;
2737         void *priv;
2738         mdk_rdev_t *rdev;
2739
2740         if (mddev->pers == NULL) {
2741                 if (len == 0)
2742                         return 0;
2743                 if (len >= sizeof(mddev->clevel))
2744                         return -ENOSPC;
2745                 strncpy(mddev->clevel, buf, len);
2746                 if (mddev->clevel[len-1] == '\n')
2747                         len--;
2748                 mddev->clevel[len] = 0;
2749                 mddev->level = LEVEL_NONE;
2750                 return rv;
2751         }
2752
2753         /* request to change the personality.  Need to ensure:
2754          *  - array is not engaged in resync/recovery/reshape
2755          *  - old personality can be suspended
2756          *  - new personality will access other array.
2757          */
2758
2759         if (mddev->sync_thread || mddev->reshape_position != MaxSector)
2760                 return -EBUSY;
2761
2762         if (!mddev->pers->quiesce) {
2763                 printk(KERN_WARNING "md: %s: %s does not support online personality change\n",
2764                        mdname(mddev), mddev->pers->name);
2765                 return -EINVAL;
2766         }
2767
2768         /* Now find the new personality */
2769         if (len == 0 || len >= sizeof(level))
2770                 return -EINVAL;
2771         strncpy(level, buf, len);
2772         if (level[len-1] == '\n')
2773                 len--;
2774         level[len] = 0;
2775
2776         request_module("md-%s", level);
2777         spin_lock(&pers_lock);
2778         pers = find_pers(LEVEL_NONE, level);
2779         if (!pers || !try_module_get(pers->owner)) {
2780                 spin_unlock(&pers_lock);
2781                 printk(KERN_WARNING "md: personality %s not loaded\n", level);
2782                 return -EINVAL;
2783         }
2784         spin_unlock(&pers_lock);
2785
2786         if (pers == mddev->pers) {
2787                 /* Nothing to do! */
2788                 module_put(pers->owner);
2789                 return rv;
2790         }
2791         if (!pers->takeover) {
2792                 module_put(pers->owner);
2793                 printk(KERN_WARNING "md: %s: %s does not support personality takeover\n",
2794                        mdname(mddev), level);
2795                 return -EINVAL;
2796         }
2797
2798         /* ->takeover must set new_* and/or delta_disks
2799          * if it succeeds, and may set them when it fails.
2800          */
2801         priv = pers->takeover(mddev);
2802         if (IS_ERR(priv)) {
2803                 mddev->new_level = mddev->level;
2804                 mddev->new_layout = mddev->layout;
2805                 mddev->new_chunk_sectors = mddev->chunk_sectors;
2806                 mddev->raid_disks -= mddev->delta_disks;
2807                 mddev->delta_disks = 0;
2808                 module_put(pers->owner);
2809                 printk(KERN_WARNING "md: %s: %s would not accept array\n",
2810                        mdname(mddev), level);
2811                 return PTR_ERR(priv);
2812         }
2813
2814         /* Looks like we have a winner */
2815         mddev_suspend(mddev);
2816         mddev->pers->stop(mddev);
2817         module_put(mddev->pers->owner);
2818         /* Invalidate devices that are now superfluous */
2819         list_for_each_entry(rdev, &mddev->disks, same_set)
2820                 if (rdev->raid_disk >= mddev->raid_disks) {
2821                         rdev->raid_disk = -1;
2822                         clear_bit(In_sync, &rdev->flags);
2823                 }
2824         mddev->pers = pers;
2825         mddev->private = priv;
2826         strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2827         mddev->level = mddev->new_level;
2828         mddev->layout = mddev->new_layout;
2829         mddev->chunk_sectors = mddev->new_chunk_sectors;
2830         mddev->delta_disks = 0;
2831         pers->run(mddev);
2832         mddev_resume(mddev);
2833         set_bit(MD_CHANGE_DEVS, &mddev->flags);
2834         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2835         md_wakeup_thread(mddev->thread);
2836         return rv;
2837 }
2838
2839 static struct md_sysfs_entry md_level =
2840 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2841
2842
2843 static ssize_t
2844 layout_show(mddev_t *mddev, char *page)
2845 {
2846         /* just a number, not meaningful for all levels */
2847         if (mddev->reshape_position != MaxSector &&
2848             mddev->layout != mddev->new_layout)
2849                 return sprintf(page, "%d (%d)\n",
2850                                mddev->new_layout, mddev->layout);
2851         return sprintf(page, "%d\n", mddev->layout);
2852 }
2853
2854 static ssize_t
2855 layout_store(mddev_t *mddev, const char *buf, size_t len)
2856 {
2857         char *e;
2858         unsigned long n = simple_strtoul(buf, &e, 10);
2859
2860         if (!*buf || (*e && *e != '\n'))
2861                 return -EINVAL;
2862
2863         if (mddev->pers) {
2864                 int err;
2865                 if (mddev->pers->check_reshape == NULL)
2866                         return -EBUSY;
2867                 mddev->new_layout = n;
2868                 err = mddev->pers->check_reshape(mddev);
2869                 if (err) {
2870                         mddev->new_layout = mddev->layout;
2871                         return err;
2872                 }
2873         } else {
2874                 mddev->new_layout = n;
2875                 if (mddev->reshape_position == MaxSector)
2876                         mddev->layout = n;
2877         }
2878         return len;
2879 }
2880 static struct md_sysfs_entry md_layout =
2881 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2882
2883
2884 static ssize_t
2885 raid_disks_show(mddev_t *mddev, char *page)
2886 {
2887         if (mddev->raid_disks == 0)
2888                 return 0;
2889         if (mddev->reshape_position != MaxSector &&
2890             mddev->delta_disks != 0)
2891                 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2892                                mddev->raid_disks - mddev->delta_disks);
2893         return sprintf(page, "%d\n", mddev->raid_disks);
2894 }
2895
2896 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2897
2898 static ssize_t
2899 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2900 {
2901         char *e;
2902         int rv = 0;
2903         unsigned long n = simple_strtoul(buf, &e, 10);
2904
2905         if (!*buf || (*e && *e != '\n'))
2906                 return -EINVAL;
2907
2908         if (mddev->pers)
2909                 rv = update_raid_disks(mddev, n);
2910         else if (mddev->reshape_position != MaxSector) {
2911                 int olddisks = mddev->raid_disks - mddev->delta_disks;
2912                 mddev->delta_disks = n - olddisks;
2913                 mddev->raid_disks = n;
2914         } else
2915                 mddev->raid_disks = n;
2916         return rv ? rv : len;
2917 }
2918 static struct md_sysfs_entry md_raid_disks =
2919 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2920
2921 static ssize_t
2922 chunk_size_show(mddev_t *mddev, char *page)
2923 {
2924         if (mddev->reshape_position != MaxSector &&
2925             mddev->chunk_sectors != mddev->new_chunk_sectors)
2926                 return sprintf(page, "%d (%d)\n",
2927                                mddev->new_chunk_sectors << 9,
2928                                mddev->chunk_sectors << 9);
2929         return sprintf(page, "%d\n", mddev->chunk_sectors << 9);
2930 }
2931
2932 static ssize_t
2933 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2934 {
2935         char *e;
2936         unsigned long n = simple_strtoul(buf, &e, 10);
2937
2938         if (!*buf || (*e && *e != '\n'))
2939                 return -EINVAL;
2940
2941         if (mddev->pers) {
2942                 int err;
2943                 if (mddev->pers->check_reshape == NULL)
2944                         return -EBUSY;
2945                 mddev->new_chunk_sectors = n >> 9;
2946                 err = mddev->pers->check_reshape(mddev);
2947                 if (err) {
2948                         mddev->new_chunk_sectors = mddev->chunk_sectors;
2949                         return err;
2950                 }
2951         } else {
2952                 mddev->new_chunk_sectors = n >> 9;
2953                 if (mddev->reshape_position == MaxSector)
2954                         mddev->chunk_sectors = n >> 9;
2955         }
2956         return len;
2957 }
2958 static struct md_sysfs_entry md_chunk_size =
2959 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2960
2961 static ssize_t
2962 resync_start_show(mddev_t *mddev, char *page)
2963 {
2964         if (mddev->recovery_cp == MaxSector)
2965                 return sprintf(page, "none\n");
2966         return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2967 }
2968
2969 static ssize_t
2970 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2971 {
2972         char *e;
2973         unsigned long long n = simple_strtoull(buf, &e, 10);
2974
2975         if (mddev->pers)
2976                 return -EBUSY;
2977         if (!*buf || (*e && *e != '\n'))
2978                 return -EINVAL;
2979
2980         mddev->recovery_cp = n;
2981         return len;
2982 }
2983 static struct md_sysfs_entry md_resync_start =
2984 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2985
2986 /*
2987  * The array state can be:
2988  *
2989  * clear
2990  *     No devices, no size, no level
2991  *     Equivalent to STOP_ARRAY ioctl
2992  * inactive
2993  *     May have some settings, but array is not active
2994  *        all IO results in error
2995  *     When written, doesn't tear down array, but just stops it
2996  * suspended (not supported yet)
2997  *     All IO requests will block. The array can be reconfigured.
2998  *     Writing this, if accepted, will block until array is quiescent
2999  * readonly
3000  *     no resync can happen.  no superblocks get written.
3001  *     write requests fail
3002  * read-auto
3003  *     like readonly, but behaves like 'clean' on a write request.
3004  *
3005  * clean - no pending writes, but otherwise active.
3006  *     When written to inactive array, starts without resync
3007  *     If a write request arrives then
3008  *       if metadata is known, mark 'dirty' and switch to 'active'.
3009  *       if not known, block and switch to write-pending
3010  *     If written to an active array that has pending writes, then fails.
3011  * active
3012  *     fully active: IO and resync can be happening.
3013  *     When written to inactive array, starts with resync
3014  *
3015  * write-pending
3016  *     clean, but writes are blocked waiting for 'active' to be written.
3017  *
3018  * active-idle
3019  *     like active, but no writes have been seen for a while (100msec).
3020  *
3021  */
3022 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
3023                    write_pending, active_idle, bad_word};
3024 static char *array_states[] = {
3025         "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
3026         "write-pending", "active-idle", NULL };
3027
3028 static int match_word(const char *word, char **list)
3029 {
3030         int n;
3031         for (n=0; list[n]; n++)
3032                 if (cmd_match(word, list[n]))
3033                         break;
3034         return n;
3035 }
3036
3037 static ssize_t
3038 array_state_show(mddev_t *mddev, char *page)
3039 {
3040         enum array_state st = inactive;
3041
3042         if (mddev->pers)
3043                 switch(mddev->ro) {
3044                 case 1:
3045                         st = readonly;
3046                         break;
3047                 case 2:
3048                         st = read_auto;
3049                         break;
3050                 case 0:
3051                         if (mddev->in_sync)
3052                                 st = clean;
3053                         else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
3054                                 st = write_pending;
3055                         else if (mddev->safemode)
3056                                 st = active_idle;
3057                         else
3058                                 st = active;
3059                 }
3060         else {
3061                 if (list_empty(&mddev->disks) &&
3062                     mddev->raid_disks == 0 &&
3063                     mddev->dev_sectors == 0)
3064                         st = clear;
3065                 else
3066                         st = inactive;
3067         }
3068         return sprintf(page, "%s\n", array_states[st]);
3069 }
3070
3071 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
3072 static int do_md_run(mddev_t * mddev);
3073 static int restart_array(mddev_t *mddev);
3074
3075 static ssize_t
3076 array_state_store(mddev_t *mddev, const char *buf, size_t len)
3077 {
3078         int err = -EINVAL;
3079         enum array_state st = match_word(buf, array_states);
3080         switch(st) {
3081         case bad_word:
3082                 break;
3083         case clear:
3084                 /* stopping an active array */
3085                 if (atomic_read(&mddev->openers) > 0)
3086                         return -EBUSY;
3087                 err = do_md_stop(mddev, 0, 0);
3088                 break;
3089         case inactive:
3090                 /* stopping an active array */
3091                 if (mddev->pers) {
3092                         if (atomic_read(&mddev->openers) > 0)
3093                                 return -EBUSY;
3094                         err = do_md_stop(mddev, 2, 0);
3095                 } else
3096                         err = 0; /* already inactive */
3097                 break;
3098         case suspended:
3099                 break; /* not supported yet */
3100         case readonly:
3101                 if (mddev->pers)
3102                         err = do_md_stop(mddev, 1, 0);
3103                 else {
3104                         mddev->ro = 1;
3105                         set_disk_ro(mddev->gendisk, 1);
3106                         err = do_md_run(mddev);
3107                 }
3108                 break;
3109         case read_auto:
3110                 if (mddev->pers) {
3111                         if (mddev->ro == 0)
3112                                 err = do_md_stop(mddev, 1, 0);
3113                         else if (mddev->ro == 1)
3114                                 err = restart_array(mddev);
3115                         if (err == 0) {
3116                                 mddev->ro = 2;
3117                                 set_disk_ro(mddev->gendisk, 0);
3118                         }
3119                 } else {
3120                         mddev->ro = 2;
3121                         err = do_md_run(mddev);
3122                 }
3123                 break;
3124         case clean:
3125                 if (mddev->pers) {
3126                         restart_array(mddev);
3127                         spin_lock_irq(&mddev->write_lock);
3128                         if (atomic_read(&mddev->writes_pending) == 0) {
3129                                 if (mddev->in_sync == 0) {
3130                                         mddev->in_sync = 1;
3131                                         if (mddev->safemode == 1)
3132                                                 mddev->safemode = 0;
3133                                         if (mddev->persistent)
3134                                                 set_bit(MD_CHANGE_CLEAN,
3135                                                         &mddev->flags);
3136                                 }
3137                                 err = 0;
3138                         } else
3139                                 err = -EBUSY;
3140                         spin_unlock_irq(&mddev->write_lock);
3141                 } else
3142                         err = -EINVAL;
3143                 break;
3144         case active:
3145                 if (mddev->pers) {
3146                         restart_array(mddev);
3147                         if (mddev->external)
3148                                 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
3149                         wake_up(&mddev->sb_wait);
3150                         err = 0;
3151                 } else {
3152                         mddev->ro = 0;
3153                         set_disk_ro(mddev->gendisk, 0);
3154                         err = do_md_run(mddev);
3155                 }
3156                 break;
3157         case write_pending:
3158         case active_idle:
3159                 /* these cannot be set */
3160                 break;
3161         }
3162         if (err)
3163                 return err;
3164         else {
3165                 sysfs_notify_dirent(mddev->sysfs_state);
3166                 return len;
3167         }
3168 }
3169 static struct md_sysfs_entry md_array_state =
3170 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
3171
3172 static ssize_t
3173 null_show(mddev_t *mddev, char *page)
3174 {
3175         return -EINVAL;
3176 }
3177
3178 static ssize_t
3179 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
3180 {
3181         /* buf must be %d:%d\n? giving major and minor numbers */
3182         /* The new device is added to the array.
3183          * If the array has a persistent superblock, we read the
3184          * superblock to initialise info and check validity.
3185          * Otherwise, only checking done is that in bind_rdev_to_array,
3186          * which mainly checks size.
3187          */
3188         char *e;
3189         int major = simple_strtoul(buf, &e, 10);
3190         int minor;
3191         dev_t dev;
3192         mdk_rdev_t *rdev;
3193         int err;
3194
3195         if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
3196                 return -EINVAL;
3197         minor = simple_strtoul(e+1, &e, 10);
3198         if (*e && *e != '\n')
3199                 return -EINVAL;
3200         dev = MKDEV(major, minor);
3201         if (major != MAJOR(dev) ||
3202             minor != MINOR(dev))
3203                 return -EOVERFLOW;
3204
3205
3206         if (mddev->persistent) {
3207                 rdev = md_import_device(dev, mddev->major_version,
3208                                         mddev->minor_version);
3209                 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
3210                         mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3211                                                        mdk_rdev_t, same_set);
3212                         err = super_types[mddev->major_version]
3213                                 .load_super(rdev, rdev0, mddev->minor_version);
3214                         if (err < 0)
3215                                 goto out;
3216                 }
3217         } else if (mddev->external)
3218                 rdev = md_import_device(dev, -2, -1);
3219         else
3220                 rdev = md_import_device(dev, -1, -1);
3221
3222         if (IS_ERR(rdev))
3223                 return PTR_ERR(rdev);
3224         err = bind_rdev_to_array(rdev, mddev);
3225  out:
3226         if (err)
3227                 export_rdev(rdev);
3228         return err ? err : len;
3229 }
3230
3231 static struct md_sysfs_entry md_new_device =
3232 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
3233
3234 static ssize_t
3235 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
3236 {
3237         char *end;
3238         unsigned long chunk, end_chunk;
3239
3240         if (!mddev->bitmap)
3241                 goto out;
3242         /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
3243         while (*buf) {
3244                 chunk = end_chunk = simple_strtoul(buf, &end, 0);
3245                 if (buf == end) break;
3246                 if (*end == '-') { /* range */
3247                         buf = end + 1;
3248                         end_chunk = simple_strtoul(buf, &end, 0);
3249                         if (buf == end) break;
3250                 }
3251                 if (*end && !isspace(*end)) break;
3252                 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
3253                 buf = end;
3254                 while (isspace(*buf)) buf++;
3255         }
3256         bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
3257 out:
3258         return len;
3259 }
3260
3261 static struct md_sysfs_entry md_bitmap =
3262 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
3263
3264 static ssize_t
3265 size_show(mddev_t *mddev, char *page)
3266 {
3267         return sprintf(page, "%llu\n",
3268                 (unsigned long long)mddev->dev_sectors / 2);
3269 }
3270
3271 static int update_size(mddev_t *mddev, sector_t num_sectors);
3272
3273 static ssize_t
3274 size_store(mddev_t *mddev, const char *buf, size_t len)
3275 {
3276         /* If array is inactive, we can reduce the component size, but
3277          * not increase it (except from 0).
3278          * If array is active, we can try an on-line resize
3279          */
3280         sector_t sectors;
3281         int err = strict_blocks_to_sectors(buf, &sectors);
3282
3283         if (err < 0)
3284                 return err;
3285         if (mddev->pers) {
3286                 err = update_size(mddev, sectors);
3287                 md_update_sb(mddev, 1);
3288         } else {
3289                 if (mddev->dev_sectors == 0 ||
3290                     mddev->dev_sectors > sectors)
3291                         mddev->dev_sectors = sectors;
3292                 else
3293                         err = -ENOSPC;
3294         }
3295         return err ? err : len;
3296 }
3297
3298 static struct md_sysfs_entry md_size =
3299 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
3300
3301
3302 /* Metdata version.
3303  * This is one of
3304  *   'none' for arrays with no metadata (good luck...)
3305  *   'external' for arrays with externally managed metadata,
3306  * or N.M for internally known formats
3307  */
3308 static ssize_t
3309 metadata_show(mddev_t *mddev, char *page)
3310 {
3311         if (mddev->persistent)
3312                 return sprintf(page, "%d.%d\n",
3313                                mddev->major_version, mddev->minor_version);
3314         else if (mddev->external)
3315                 return sprintf(page, "external:%s\n", mddev->metadata_type);
3316         else
3317                 return sprintf(page, "none\n");
3318 }
3319
3320 static ssize_t
3321 metadata_store(mddev_t *mddev, const char *buf, size_t len)
3322 {
3323         int major, minor;
3324         char *e;
3325         /* Changing the details of 'external' metadata is
3326          * always permitted.  Otherwise there must be
3327          * no devices attached to the array.
3328          */
3329         if (mddev->external && strncmp(buf, "external:", 9) == 0)
3330                 ;
3331         else if (!list_empty(&mddev->disks))
3332                 return -EBUSY;
3333
3334         if (cmd_match(buf, "none")) {
3335                 mddev->persistent = 0;
3336                 mddev->external = 0;
3337                 mddev->major_version = 0;
3338                 mddev->minor_version = 90;
3339                 return len;
3340         }
3341         if (strncmp(buf, "external:", 9) == 0) {
3342                 size_t namelen = len-9;
3343                 if (namelen >= sizeof(mddev->metadata_type))
3344                         namelen = sizeof(mddev->metadata_type)-1;
3345                 strncpy(mddev->metadata_type, buf+9, namelen);
3346                 mddev->metadata_type[namelen] = 0;
3347                 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3348                         mddev->metadata_type[--namelen] = 0;
3349                 mddev->persistent = 0;
3350                 mddev->external = 1;
3351                 mddev->major_version = 0;
3352                 mddev->minor_version = 90;
3353                 return len;
3354         }
3355         major = simple_strtoul(buf, &e, 10);
3356         if (e==buf || *e != '.')
3357                 return -EINVAL;
3358         buf = e+1;
3359         minor = simple_strtoul(buf, &e, 10);
3360         if (e==buf || (*e && *e != '\n') )
3361                 return -EINVAL;
3362         if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3363                 return -ENOENT;
3364         mddev->major_version = major;
3365         mddev->minor_version = minor;
3366         mddev->persistent = 1;
3367         mddev->external = 0;
3368         return len;
3369 }
3370
3371 static struct md_sysfs_entry md_metadata =
3372 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3373
3374 static ssize_t
3375 action_show(mddev_t *mddev, char *page)
3376 {
3377         char *type = "idle";
3378         if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3379                 type = "frozen";
3380         else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3381             (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3382                 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3383                         type = "reshape";
3384                 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3385                         if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3386                                 type = "resync";
3387                         else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3388                                 type = "check";
3389                         else
3390                                 type = "repair";
3391                 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3392                         type = "recover";
3393         }
3394         return sprintf(page, "%s\n", type);
3395 }
3396
3397 static ssize_t
3398 action_store(mddev_t *mddev, const char *page, size_t len)
3399 {
3400         if (!mddev->pers || !mddev->pers->sync_request)
3401                 return -EINVAL;
3402
3403         if (cmd_match(page, "frozen"))
3404                 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3405         else
3406                 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3407
3408         if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
3409                 if (mddev->sync_thread) {
3410                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3411                         md_unregister_thread(mddev->sync_thread);
3412                         mddev->sync_thread = NULL;
3413                         mddev->recovery = 0;
3414                 }
3415         } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3416                    test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3417                 return -EBUSY;
3418         else if (cmd_match(page, "resync"))
3419                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3420         else if (cmd_match(page, "recover")) {
3421                 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3422                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3423         } else if (cmd_match(page, "reshape")) {
3424                 int err;
3425                 if (mddev->pers->start_reshape == NULL)
3426                         return -EINVAL;
3427                 err = mddev->pers->start_reshape(mddev);
3428                 if (err)
3429                         return err;
3430                 sysfs_notify(&mddev->kobj, NULL, "degraded");
3431         } else {
3432                 if (cmd_match(page, "check"))
3433                         set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3434                 else if (!cmd_match(page, "repair"))
3435                         return -EINVAL;
3436                 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3437                 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3438         }
3439         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3440         md_wakeup_thread(mddev->thread);
3441         sysfs_notify_dirent(mddev->sysfs_action);
3442         return len;
3443 }
3444
3445 static ssize_t
3446 mismatch_cnt_show(mddev_t *mddev, char *page)
3447 {
3448         return sprintf(page, "%llu\n",
3449                        (unsigned long long) mddev->resync_mismatches);
3450 }
3451
3452 static struct md_sysfs_entry md_scan_mode =
3453 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3454
3455
3456 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3457
3458 static ssize_t
3459 sync_min_show(mddev_t *mddev, char *page)
3460 {
3461         return sprintf(page, "%d (%s)\n", speed_min(mddev),
3462                        mddev->sync_speed_min ? "local": "system");
3463 }
3464
3465 static ssize_t
3466 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3467 {
3468         int min;
3469         char *e;
3470         if (strncmp(buf, "system", 6)==0) {
3471                 mddev->sync_speed_min = 0;
3472                 return len;
3473         }
3474         min = simple_strtoul(buf, &e, 10);
3475         if (buf == e || (*e && *e != '\n') || min <= 0)
3476                 return -EINVAL;
3477         mddev->sync_speed_min = min;
3478         return len;
3479 }
3480
3481 static struct md_sysfs_entry md_sync_min =
3482 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3483
3484 static ssize_t
3485 sync_max_show(mddev_t *mddev, char *page)
3486 {
3487         return sprintf(page, "%d (%s)\n", speed_max(mddev),
3488                        mddev->sync_speed_max ? "local": "system");
3489 }
3490
3491 static ssize_t
3492 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3493 {
3494         int max;
3495         char *e;
3496         if (strncmp(buf, "system", 6)==0) {
3497                 mddev->sync_speed_max = 0;
3498                 return len;
3499         }
3500         max = simple_strtoul(buf, &e, 10);
3501         if (buf == e || (*e && *e != '\n') || max <= 0)
3502                 return -EINVAL;
3503         mddev->sync_speed_max = max;
3504         return len;
3505 }
3506
3507 static struct md_sysfs_entry md_sync_max =
3508 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3509
3510 static ssize_t
3511 degraded_show(mddev_t *mddev, char *page)
3512 {
3513         return sprintf(page, "%d\n", mddev->degraded);
3514 }
3515 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3516
3517 static ssize_t
3518 sync_force_parallel_show(mddev_t *mddev, char *page)
3519 {
3520         return sprintf(page, "%d\n", mddev->parallel_resync);
3521 }
3522
3523 static ssize_t
3524 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3525 {
3526         long n;
3527
3528         if (strict_strtol(buf, 10, &n))
3529                 return -EINVAL;
3530
3531         if (n != 0 && n != 1)
3532                 return -EINVAL;
3533
3534         mddev->parallel_resync = n;
3535
3536         if (mddev->sync_thread)
3537                 wake_up(&resync_wait);
3538
3539         return len;
3540 }
3541
3542 /* force parallel resync, even with shared block devices */
3543 static struct md_sysfs_entry md_sync_force_parallel =
3544 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3545        sync_force_parallel_show, sync_force_parallel_store);
3546
3547 static ssize_t
3548 sync_speed_show(mddev_t *mddev, char *page)
3549 {
3550         unsigned long resync, dt, db;
3551         if (mddev->curr_resync == 0)
3552                 return sprintf(page, "none\n");
3553         resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3554         dt = (jiffies - mddev->resync_mark) / HZ;
3555         if (!dt) dt++;
3556         db = resync - mddev->resync_mark_cnt;
3557         return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3558 }
3559
3560 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3561
3562 static ssize_t
3563 sync_completed_show(mddev_t *mddev, char *page)
3564 {
3565         unsigned long max_sectors, resync;
3566
3567         if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3568                 return sprintf(page, "none\n");
3569
3570         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3571                 max_sectors = mddev->resync_max_sectors;
3572         else
3573                 max_sectors = mddev->dev_sectors;
3574
3575         resync = mddev->curr_resync_completed;
3576         return sprintf(page, "%lu / %lu\n", resync, max_sectors);
3577 }
3578
3579 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3580
3581 static ssize_t
3582 min_sync_show(mddev_t *mddev, char *page)
3583 {
3584         return sprintf(page, "%llu\n",
3585                        (unsigned long long)mddev->resync_min);
3586 }
3587 static ssize_t
3588 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3589 {
3590         unsigned long long min;
3591         if (strict_strtoull(buf, 10, &min))
3592                 return -EINVAL;
3593         if (min > mddev->resync_max)
3594                 return -EINVAL;
3595         if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3596                 return -EBUSY;
3597
3598         /* Must be a multiple of chunk_size */
3599         if (mddev->chunk_sectors) {
3600                 sector_t temp = min;
3601                 if (sector_div(temp, mddev->chunk_sectors))
3602                         return -EINVAL;
3603         }
3604         mddev->resync_min = min;
3605
3606         return len;
3607 }
3608
3609 static struct md_sysfs_entry md_min_sync =
3610 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3611
3612 static ssize_t
3613 max_sync_show(mddev_t *mddev, char *page)
3614 {
3615         if (mddev->resync_max == MaxSector)
3616                 return sprintf(page, "max\n");
3617         else
3618                 return sprintf(page, "%llu\n",
3619                                (unsigned long long)mddev->resync_max);
3620 }
3621 static ssize_t
3622 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3623 {
3624         if (strncmp(buf, "max", 3) == 0)
3625                 mddev->resync_max = MaxSector;
3626         else {
3627                 unsigned long long max;
3628                 if (strict_strtoull(buf, 10, &max))
3629                         return -EINVAL;
3630                 if (max < mddev->resync_min)
3631                         return -EINVAL;
3632                 if (max < mddev->resync_max &&
3633                     mddev->ro == 0 &&
3634                     test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3635                         return -EBUSY;
3636
3637                 /* Must be a multiple of chunk_size */
3638                 if (mddev->chunk_sectors) {
3639                         sector_t temp = max;
3640                         if (sector_div(temp, mddev->chunk_sectors))
3641                                 return -EINVAL;
3642                 }
3643                 mddev->resync_max = max;
3644         }
3645         wake_up(&mddev->recovery_wait);
3646         return len;
3647 }
3648
3649 static struct md_sysfs_entry md_max_sync =
3650 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3651
3652 static ssize_t
3653 suspend_lo_show(mddev_t *mddev, char *page)
3654 {
3655         return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3656 }
3657
3658 static ssize_t
3659 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3660 {
3661         char *e;
3662         unsigned long long new = simple_strtoull(buf, &e, 10);
3663
3664         if (mddev->pers == NULL ||
3665             mddev->pers->quiesce == NULL)
3666                 return -EINVAL;
3667         if (buf == e || (*e && *e != '\n'))
3668                 return -EINVAL;
3669         if (new >= mddev->suspend_hi ||
3670             (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3671                 mddev->suspend_lo = new;
3672                 mddev->pers->quiesce(mddev, 2);
3673                 return len;
3674         } else
3675                 return -EINVAL;
3676 }
3677 static struct md_sysfs_entry md_suspend_lo =
3678 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3679
3680
3681 static ssize_t
3682 suspend_hi_show(mddev_t *mddev, char *page)
3683 {
3684         return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3685 }
3686
3687 static ssize_t
3688 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3689 {
3690         char *e;
3691         unsigned long long new = simple_strtoull(buf, &e, 10);
3692
3693         if (mddev->pers == NULL ||
3694             mddev->pers->quiesce == NULL)
3695                 return -EINVAL;
3696         if (buf == e || (*e && *e != '\n'))
3697                 return -EINVAL;
3698         if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3699             (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3700                 mddev->suspend_hi = new;
3701                 mddev->pers->quiesce(mddev, 1);
3702                 mddev->pers->quiesce(mddev, 0);
3703                 return len;
3704         } else
3705                 return -EINVAL;
3706 }
3707 static struct md_sysfs_entry md_suspend_hi =
3708 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3709
3710 static ssize_t
3711 reshape_position_show(mddev_t *mddev, char *page)
3712 {
3713         if (mddev->reshape_position != MaxSector)
3714                 return sprintf(page, "%llu\n",
3715                                (unsigned long long)mddev->reshape_position);
3716         strcpy(page, "none\n");
3717         return 5;
3718 }
3719
3720 static ssize_t
3721 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3722 {
3723         char *e;
3724         unsigned long long new = simple_strtoull(buf, &e, 10);
3725         if (mddev->pers)
3726                 return -EBUSY;
3727         if (buf == e || (*e && *e != '\n'))
3728                 return -EINVAL;
3729         mddev->reshape_position = new;
3730         mddev->delta_disks = 0;
3731         mddev->new_level = mddev->level;
3732         mddev->new_layout = mddev->layout;
3733         mddev->new_chunk_sectors = mddev->chunk_sectors;
3734         return len;
3735 }
3736
3737 static struct md_sysfs_entry md_reshape_position =
3738 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3739        reshape_position_store);
3740
3741 static ssize_t
3742 array_size_show(mddev_t *mddev, char *page)
3743 {
3744         if (mddev->external_size)
3745                 return sprintf(page, "%llu\n",
3746                                (unsigned long long)mddev->array_sectors/2);
3747         else
3748                 return sprintf(page, "default\n");
3749 }
3750
3751 static ssize_t
3752 array_size_store(mddev_t *mddev, const char *buf, size_t len)
3753 {
3754         sector_t sectors;
3755
3756         if (strncmp(buf, "default", 7) == 0) {
3757                 if (mddev->pers)
3758                         sectors = mddev->pers->size(mddev, 0, 0);
3759                 else
3760                         sectors = mddev->array_sectors;
3761
3762                 mddev->external_size = 0;
3763         } else {
3764                 if (strict_blocks_to_sectors(buf, &sectors) < 0)
3765                         return -EINVAL;
3766                 if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors)
3767                         return -E2BIG;
3768
3769                 mddev->external_size = 1;
3770         }
3771
3772         mddev->array_sectors = sectors;
3773         set_capacity(mddev->gendisk, mddev->array_sectors);
3774         if (mddev->pers)
3775                 revalidate_disk(mddev->gendisk);
3776
3777         return len;
3778 }
3779
3780 static struct md_sysfs_entry md_array_size =
3781 __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show,
3782        array_size_store);
3783
3784 static struct attribute *md_default_attrs[] = {
3785         &md_level.attr,
3786         &md_layout.attr,
3787         &md_raid_disks.attr,
3788         &md_chunk_size.attr,
3789         &md_size.attr,
3790         &md_resync_start.attr,
3791         &md_metadata.attr,
3792         &md_new_device.attr,
3793         &md_safe_delay.attr,
3794         &md_array_state.attr,
3795         &md_reshape_position.attr,
3796         &md_array_size.attr,
3797         NULL,
3798 };
3799
3800 static struct attribute *md_redundancy_attrs[] = {
3801         &md_scan_mode.attr,
3802         &md_mismatches.attr,
3803         &md_sync_min.attr,
3804         &md_sync_max.attr,
3805         &md_sync_speed.attr,
3806         &md_sync_force_parallel.attr,
3807         &md_sync_completed.attr,
3808         &md_min_sync.attr,
3809         &md_max_sync.attr,
3810         &md_suspend_lo.attr,
3811         &md_suspend_hi.attr,
3812         &md_bitmap.attr,
3813         &md_degraded.attr,
3814         NULL,
3815 };
3816 static struct attribute_group md_redundancy_group = {
3817         .name = NULL,
3818         .attrs = md_redundancy_attrs,
3819 };
3820
3821
3822 static ssize_t
3823 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3824 {
3825         struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3826         mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3827         ssize_t rv;
3828
3829         if (!entry->show)
3830                 return -EIO;
3831         rv = mddev_lock(mddev);
3832         if (!rv) {
3833                 rv = entry->show(mddev, page);
3834                 mddev_unlock(mddev);
3835         }
3836         return rv;
3837 }
3838
3839 static ssize_t
3840 md_attr_store(struct kobject *kobj, struct attribute *attr,
3841               const char *page, size_t length)
3842 {
3843         struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3844         mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3845         ssize_t rv;
3846
3847         if (!entry->store)
3848                 return -EIO;
3849         if (!capable(CAP_SYS_ADMIN))
3850                 return -EACCES;
3851         rv = mddev_lock(mddev);
3852         if (mddev->hold_active == UNTIL_IOCTL)
3853                 mddev->hold_active = 0;
3854         if (!rv) {
3855                 rv = entry->store(mddev, page, length);
3856                 mddev_unlock(mddev);
3857         }
3858         return rv;
3859 }
3860
3861 static void md_free(struct kobject *ko)
3862 {
3863         mddev_t *mddev = container_of(ko, mddev_t, kobj);
3864
3865         if (mddev->sysfs_state)
3866                 sysfs_put(mddev->sysfs_state);
3867
3868         if (mddev->gendisk) {
3869                 del_gendisk(mddev->gendisk);
3870                 put_disk(mddev->gendisk);
3871         }
3872         if (mddev->queue)
3873                 blk_cleanup_queue(mddev->queue);
3874
3875         kfree(mddev);
3876 }
3877
3878 static struct sysfs_ops md_sysfs_ops = {
3879         .show   = md_attr_show,
3880         .store  = md_attr_store,
3881 };
3882 static struct kobj_type md_ktype = {
3883         .release        = md_free,
3884         .sysfs_ops      = &md_sysfs_ops,
3885         .default_attrs  = md_default_attrs,
3886 };
3887
3888 int mdp_major = 0;
3889
3890 static void mddev_delayed_delete(struct work_struct *ws)
3891 {
3892         mddev_t *mddev = container_of(ws, mddev_t, del_work);
3893
3894         if (mddev->private == &md_redundancy_group) {
3895                 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3896                 if (mddev->sysfs_action)
3897                         sysfs_put(mddev->sysfs_action);
3898                 mddev->sysfs_action = NULL;
3899                 mddev->private = NULL;
3900         }
3901         kobject_del(&mddev->kobj);
3902         kobject_put(&mddev->kobj);
3903 }
3904
3905 static int md_alloc(dev_t dev, char *name)
3906 {
3907         static DEFINE_MUTEX(disks_mutex);
3908         mddev_t *mddev = mddev_find(dev);
3909         struct gendisk *disk;
3910         int partitioned;
3911         int shift;
3912         int unit;
3913         int error;
3914
3915         if (!mddev)
3916                 return -ENODEV;
3917
3918         partitioned = (MAJOR(mddev->unit) != MD_MAJOR);
3919         shift = partitioned ? MdpMinorShift : 0;
3920         unit = MINOR(mddev->unit) >> shift;
3921
3922         /* wait for any previous instance if this device
3923          * to be completed removed (mddev_delayed_delete).
3924          */
3925         flush_scheduled_work();
3926
3927         mutex_lock(&disks_mutex);
3928         error = -EEXIST;
3929         if (mddev->gendisk)
3930                 goto abort;
3931
3932         if (name) {
3933                 /* Need to ensure that 'name' is not a duplicate.
3934                  */
3935                 mddev_t *mddev2;
3936                 spin_lock(&all_mddevs_lock);
3937
3938                 list_for_each_entry(mddev2, &all_mddevs, all_mddevs)
3939                         if (mddev2->gendisk &&
3940                             strcmp(mddev2->gendisk->disk_name, name) == 0) {
3941                                 spin_unlock(&all_mddevs_lock);
3942                                 goto abort;
3943                         }
3944                 spin_unlock(&all_mddevs_lock);
3945         }
3946
3947         error = -ENOMEM;
3948         mddev->queue = blk_alloc_queue(GFP_KERNEL);
3949         if (!mddev->queue)
3950                 goto abort;
3951         mddev->queue->queuedata = mddev;
3952
3953         /* Can be unlocked because the queue is new: no concurrency */
3954         queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3955
3956         blk_queue_make_request(mddev->queue, md_make_request);
3957
3958         disk = alloc_disk(1 << shift);
3959         if (!disk) {
3960                 blk_cleanup_queue(mddev->queue);
3961                 mddev->queue = NULL;
3962                 goto abort;
3963         }
3964         disk->major = MAJOR(mddev->unit);
3965         disk->first_minor = unit << shift;
3966         if (name)
3967                 strcpy(disk->disk_name, name);
3968         else if (partitioned)
3969                 sprintf(disk->disk_name, "md_d%d", unit);
3970         else
3971                 sprintf(disk->disk_name, "md%d", unit);
3972         disk->fops = &md_fops;
3973         disk->private_data = mddev;
3974         disk->queue = mddev->queue;
3975         /* Allow extended partitions.  This makes the
3976          * 'mdp' device redundant, but we can't really
3977          * remove it now.
3978          */
3979         disk->flags |= GENHD_FL_EXT_DEVT;
3980         add_disk(disk);
3981         mddev->gendisk = disk;
3982         error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3983                                      &disk_to_dev(disk)->kobj, "%s", "md");
3984         if (error) {
3985                 /* This isn't possible, but as kobject_init_and_add is marked
3986                  * __must_check, we must do something with the result
3987                  */
3988                 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3989                        disk->disk_name);
3990                 error = 0;
3991         }
3992  abort:
3993         mutex_unlock(&disks_mutex);
3994         if (!error) {
3995                 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3996                 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3997         }
3998         mddev_put(mddev);
3999         return error;
4000 }
4001
4002 static struct kobject *md_probe(dev_t dev, int *part, void *data)
4003 {
4004         md_alloc(dev, NULL);
4005         return NULL;
4006 }
4007
4008 static int add_named_array(const char *val, struct kernel_param *kp)
4009 {
4010         /* val must be "md_*" where * is not all digits.
4011          * We allocate an array with a large free minor number, and
4012          * set the name to val.  val must not already be an active name.
4013          */
4014         int len = strlen(val);
4015         char buf[DISK_NAME_LEN];
4016
4017         while (len && val[len-1] == '\n')
4018                 len--;
4019         if (len >= DISK_NAME_LEN)
4020                 return -E2BIG;
4021         strlcpy(buf, val, len+1);
4022         if (strncmp(buf, "md_", 3) != 0)
4023                 return -EINVAL;
4024         return md_alloc(0, buf);
4025 }
4026
4027 static void md_safemode_timeout(unsigned long data)
4028 {
4029         mddev_t *mddev = (mddev_t *) data;
4030
4031         if (!atomic_read(&mddev->writes_pending)) {
4032                 mddev->safemode = 1;
4033                 if (mddev->external)
4034                         sysfs_notify_dirent(mddev->sysfs_state);
4035         }
4036         md_wakeup_thread(mddev->thread);
4037 }
4038
4039 static int start_dirty_degraded;
4040
4041 static int do_md_run(mddev_t * mddev)
4042 {
4043         int err;
4044         mdk_rdev_t *rdev;
4045         struct gendisk *disk;
4046         struct mdk_personality *pers;
4047
4048         if (list_empty(&mddev->disks))
4049                 /* cannot run an array with no devices.. */
4050                 return -EINVAL;
4051
4052         if (mddev->pers)
4053                 return -EBUSY;
4054
4055         /*
4056          * Analyze all RAID superblock(s)
4057          */
4058         if (!mddev->raid_disks) {
4059                 if (!mddev->persistent)
4060                         return -EINVAL;
4061                 analyze_sbs(mddev);
4062         }
4063
4064         if (mddev->level != LEVEL_NONE)
4065                 request_module("md-level-%d", mddev->level);
4066         else if (mddev->clevel[0])
4067                 request_module("md-%s", mddev->clevel);
4068
4069         /*
4070          * Drop all container device buffers, from now on
4071          * the only valid external interface is through the md
4072          * device.
4073          */
4074         list_for_each_entry(rdev, &mddev->disks, same_set) {
4075                 if (test_bit(Faulty, &rdev->flags))
4076                         continue;
4077                 sync_blockdev(rdev->bdev);
4078                 invalidate_bdev(rdev->bdev);
4079
4080                 /* perform some consistency tests on the device.
4081                  * We don't want the data to overlap the metadata,
4082                  * Internal Bitmap issues have been handled elsewhere.
4083                  */
4084                 if (rdev->data_offset < rdev->sb_start) {
4085                         if (mddev->dev_sectors &&
4086                             rdev->data_offset + mddev->dev_sectors
4087                             > rdev->sb_start) {
4088                                 printk("md: %s: data overlaps metadata\n",
4089                                        mdname(mddev));
4090                                 return -EINVAL;
4091                         }
4092                 } else {
4093                         if (rdev->sb_start + rdev->sb_size/512
4094                             > rdev->data_offset) {
4095                                 printk("md: %s: metadata overlaps data\n",
4096                                        mdname(mddev));
4097                                 return -EINVAL;
4098                         }
4099                 }
4100                 sysfs_notify_dirent(rdev->sysfs_state);
4101         }
4102
4103         md_probe(mddev->unit, NULL, NULL);
4104         disk = mddev->gendisk;
4105         if (!disk)
4106                 return -ENOMEM;
4107
4108         spin_lock(&pers_lock);
4109         pers = find_pers(mddev->level, mddev->clevel);
4110         if (!pers || !try_module_get(pers->owner)) {
4111                 spin_unlock(&pers_lock);
4112                 if (mddev->level != LEVEL_NONE)
4113                         printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
4114                                mddev->level);
4115                 else
4116                         printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
4117                                mddev->clevel);
4118                 return -EINVAL;
4119         }
4120         mddev->pers = pers;
4121         spin_unlock(&pers_lock);
4122         if (mddev->level != pers->level) {
4123                 mddev->level = pers->level;
4124                 mddev->new_level = pers->level;
4125         }
4126         strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
4127
4128         if (mddev->reshape_position != MaxSector &&
4129             pers->start_reshape == NULL) {
4130                 /* This personality cannot handle reshaping... */
4131                 mddev->pers = NULL;
4132                 module_put(pers->owner);
4133                 return -EINVAL;
4134         }
4135
4136         if (pers->sync_request) {
4137                 /* Warn if this is a potentially silly
4138                  * configuration.
4139                  */
4140                 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4141                 mdk_rdev_t *rdev2;
4142                 int warned = 0;
4143
4144                 list_for_each_entry(rdev, &mddev->disks, same_set)
4145                         list_for_each_entry(rdev2, &mddev->disks, same_set) {
4146                                 if (rdev < rdev2 &&
4147                                     rdev->bdev->bd_contains ==
4148                                     rdev2->bdev->bd_contains) {
4149                                         printk(KERN_WARNING
4150                                                "%s: WARNING: %s appears to be"
4151                                                " on the same physical disk as"
4152                                                " %s.\n",
4153                                                mdname(mddev),
4154                                                bdevname(rdev->bdev,b),
4155                                                bdevname(rdev2->bdev,b2));
4156                                         warned = 1;
4157                                 }
4158                         }
4159
4160                 if (warned)
4161                         printk(KERN_WARNING
4162                                "True protection against single-disk"
4163                                " failure might be compromised.\n");
4164         }
4165
4166         mddev->recovery = 0;
4167         /* may be over-ridden by personality */
4168         mddev->resync_max_sectors = mddev->dev_sectors;
4169
4170         mddev->barriers_work = 1;
4171         mddev->ok_start_degraded = start_dirty_degraded;
4172
4173         if (start_readonly)
4174                 mddev->ro = 2; /* read-only, but switch on first write */
4175
4176         err = mddev->pers->run(mddev);
4177         if (err)
4178                 printk(KERN_ERR "md: pers->run() failed ...\n");
4179         else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) {
4180                 WARN_ONCE(!mddev->external_size, "%s: default size too small,"
4181                           " but 'external_size' not in effect?\n", __func__);
4182                 printk(KERN_ERR
4183                        "md: invalid array_size %llu > default size %llu\n",
4184                        (unsigned long long)mddev->array_sectors / 2,
4185                        (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2);
4186                 err = -EINVAL;
4187                 mddev->pers->stop(mddev);
4188         }
4189         if (err == 0 && mddev->pers->sync_request) {
4190                 err = bitmap_create(mddev);
4191                 if (err) {
4192                         printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
4193                                mdname(mddev), err);
4194                         mddev->pers->stop(mddev);
4195                 }
4196         }
4197         if (err) {
4198                 module_put(mddev->pers->owner);
4199                 mddev->pers = NULL;
4200                 bitmap_destroy(mddev);
4201                 return err;
4202         }
4203         if (mddev->pers->sync_request) {
4204                 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
4205                         printk(KERN_WARNING
4206                                "md: cannot register extra attributes for %s\n",
4207                                mdname(mddev));
4208                 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
4209         } else if (mddev->ro == 2) /* auto-readonly not meaningful */
4210                 mddev->ro = 0;
4211
4212         atomic_set(&mddev->writes_pending,0);
4213         mddev->safemode = 0;
4214         mddev->safemode_timer.function = md_safemode_timeout;
4215         mddev->safemode_timer.data = (unsigned long) mddev;
4216         mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
4217         mddev->in_sync = 1;
4218
4219         list_for_each_entry(rdev, &mddev->disks, same_set)
4220                 if (rdev->raid_disk >= 0) {
4221                         char nm[20];
4222                         sprintf(nm, "rd%d", rdev->raid_disk);
4223                         if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
4224                                 printk("md: cannot register %s for %s\n",
4225                                        nm, mdname(mddev));
4226                 }
4227
4228         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4229
4230         if (mddev->flags)
4231                 md_update_sb(mddev, 0);
4232
4233         set_capacity(disk, mddev->array_sectors);
4234
4235         /* If there is a partially-recovered drive we need to
4236          * start recovery here.  If we leave it to md_check_recovery,
4237          * it will remove the drives and not do the right thing
4238          */
4239         if (mddev->degraded && !mddev->sync_thread) {
4240                 int spares = 0;
4241                 list_for_each_entry(rdev, &mddev->disks, same_set)
4242                         if (rdev->raid_disk >= 0 &&
4243                             !test_bit(In_sync, &rdev->flags) &&
4244                             !test_bit(Faulty, &rdev->flags))
4245                                 /* complete an interrupted recovery */
4246                                 spares++;
4247                 if (spares && mddev->pers->sync_request) {
4248                         mddev->recovery = 0;
4249                         set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4250                         mddev->sync_thread = md_register_thread(md_do_sync,
4251                                                                 mddev,
4252                                                                 "resync");
4253                         if (!mddev->sync_thread) {
4254                                 printk(KERN_ERR "%s: could not start resync"
4255                                        " thread...\n",
4256                                        mdname(mddev));
4257                                 /* leave the spares where they are, it shouldn't hurt */
4258                                 mddev->recovery = 0;
4259                         }
4260                 }
4261         }
4262         md_wakeup_thread(mddev->thread);
4263         md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
4264
4265         revalidate_disk(mddev->gendisk);
4266         mddev->changed = 1;
4267         md_new_event(mddev);
4268         sysfs_notify_dirent(mddev->sysfs_state);
4269         if (mddev->sysfs_action)
4270                 sysfs_notify_dirent(mddev->sysfs_action);
4271         sysfs_notify(&mddev->kobj, NULL, "degraded");
4272         kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4273         return 0;
4274 }
4275
4276 static int restart_array(mddev_t *mddev)
4277 {
4278         struct gendisk *disk = mddev->gendisk;
4279
4280         /* Complain if it has no devices */
4281         if (list_empty(&mddev->disks))
4282                 return -ENXIO;
4283         if (!mddev->pers)
4284                 return -EINVAL;
4285         if (!mddev->ro)
4286                 return -EBUSY;
4287         mddev->safemode = 0;
4288         mddev->ro = 0;
4289         set_disk_ro(disk, 0);
4290         printk(KERN_INFO "md: %s switched to read-write mode.\n",
4291                 mdname(mddev));
4292         /* Kick recovery or resync if necessary */
4293         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4294         md_wakeup_thread(mddev->thread);
4295         md_wakeup_thread(mddev->sync_thread);
4296         sysfs_notify_dirent(mddev->sysfs_state);
4297         return 0;
4298 }
4299
4300 /* similar to deny_write_access, but accounts for our holding a reference
4301  * to the file ourselves */
4302 static int deny_bitmap_write_access(struct file * file)
4303 {
4304         struct inode *inode = file->f_mapping->host;
4305
4306         spin_lock(&inode->i_lock);
4307         if (atomic_read(&inode->i_writecount) > 1) {
4308                 spin_unlock(&inode->i_lock);
4309                 return -ETXTBSY;
4310         }
4311         atomic_set(&inode->i_writecount, -1);
4312         spin_unlock(&inode->i_lock);
4313
4314         return 0;
4315 }
4316
4317 static void restore_bitmap_write_access(struct file *file)
4318 {
4319         struct inode *inode = file->f_mapping->host;
4320
4321         spin_lock(&inode->i_lock);
4322         atomic_set(&inode->i_writecount, 1);
4323         spin_unlock(&inode->i_lock);
4324 }
4325
4326 /* mode:
4327  *   0 - completely stop and dis-assemble array
4328  *   1 - switch to readonly
4329  *   2 - stop but do not disassemble array
4330  */
4331 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
4332 {
4333         int err = 0;
4334         struct gendisk *disk = mddev->gendisk;
4335         mdk_rdev_t *rdev;
4336
4337         mutex_lock(&mddev->open_mutex);
4338         if (atomic_read(&mddev->openers) > is_open) {
4339                 printk("md: %s still in use.\n",mdname(mddev));
4340                 err = -EBUSY;
4341         } else if (mddev->pers) {
4342
4343                 if (mddev->sync_thread) {
4344                         set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4345                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4346                         md_unregister_thread(mddev->sync_thread);
4347                         mddev->sync_thread = NULL;
4348                 }
4349
4350                 del_timer_sync(&mddev->safemode_timer);
4351
4352                 switch(mode) {
4353                 case 1: /* readonly */
4354                         err  = -ENXIO;
4355                         if (mddev->ro==1)
4356                                 goto out;
4357                         mddev->ro = 1;
4358                         break;
4359                 case 0: /* disassemble */
4360                 case 2: /* stop */
4361                         bitmap_flush(mddev);
4362                         md_super_wait(mddev);
4363                         if (mddev->ro)
4364                                 set_disk_ro(disk, 0);
4365
4366                         mddev->pers->stop(mddev);
4367                         mddev->queue->merge_bvec_fn = NULL;
4368                         mddev->queue->unplug_fn = NULL;
4369                         mddev->queue->backing_dev_info.congested_fn = NULL;
4370                         module_put(mddev->pers->owner);
4371                         if (mddev->pers->sync_request)
4372                                 mddev->private = &md_redundancy_group;
4373                         mddev->pers = NULL;
4374                         /* tell userspace to handle 'inactive' */
4375                         sysfs_notify_dirent(mddev->sysfs_state);
4376
4377                         list_for_each_entry(rdev, &mddev->disks, same_set)
4378                                 if (rdev->raid_disk >= 0) {
4379                                         char nm[20];
4380                                         sprintf(nm, "rd%d", rdev->raid_disk);
4381                                         sysfs_remove_link(&mddev->kobj, nm);
4382                                 }
4383
4384                         set_capacity(disk, 0);
4385                         mddev->changed = 1;
4386
4387                         if (mddev->ro)
4388                                 mddev->ro = 0;
4389                 }
4390                 if (!mddev->in_sync || mddev->flags) {
4391                         /* mark array as shutdown cleanly */
4392                         mddev->in_sync = 1;
4393                         md_update_sb(mddev, 1);
4394                 }
4395                 if (mode == 1)
4396                         set_disk_ro(disk, 1);
4397                 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
4398                 err = 0;
4399         }
4400 out:
4401         mutex_unlock(&mddev->open_mutex);
4402         if (err)
4403                 return err;
4404         /*
4405          * Free resources if final stop
4406          */
4407         if (mode == 0) {
4408
4409                 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
4410
4411                 bitmap_destroy(mddev);
4412                 if (mddev->bitmap_file) {
4413                         restore_bitmap_write_access(mddev->bitmap_file);
4414                         fput(mddev->bitmap_file);
4415                         mddev->bitmap_file = NULL;
4416                 }
4417                 mddev->bitmap_offset = 0;
4418
4419                 /* make sure all md_delayed_delete calls have finished */
4420                 flush_scheduled_work();
4421
4422                 export_array(mddev);
4423
4424                 mddev->array_sectors = 0;
4425                 mddev->external_size = 0;
4426                 mddev->dev_sectors = 0;
4427                 mddev->raid_disks = 0;
4428                 mddev->recovery_cp = 0;
4429                 mddev->resync_min = 0;
4430                 mddev->resync_max = MaxSector;
4431                 mddev->reshape_position = MaxSector;
4432                 mddev->external = 0;
4433                 mddev->persistent = 0;
4434                 mddev->level = LEVEL_NONE;
4435                 mddev->clevel[0] = 0;
4436                 mddev->flags = 0;
4437                 mddev->ro = 0;
4438                 mddev->metadata_type[0] = 0;
4439                 mddev->chunk_sectors = 0;
4440                 mddev->ctime = mddev->utime = 0;
4441                 mddev->layout = 0;
4442                 mddev->max_disks = 0;
4443                 mddev->events = 0;
4444                 mddev->delta_disks = 0;
4445                 mddev->new_level = LEVEL_NONE;
4446                 mddev->new_layout = 0;
4447                 mddev->new_chunk_sectors = 0;
4448                 mddev->curr_resync = 0;
4449                 mddev->resync_mismatches = 0;
4450                 mddev->suspend_lo = mddev->suspend_hi = 0;
4451                 mddev->sync_speed_min = mddev->sync_speed_max = 0;
4452                 mddev->recovery = 0;
4453                 mddev->in_sync = 0;
4454                 mddev->changed = 0;
4455                 mddev->degraded = 0;
4456                 mddev->barriers_work = 0;
4457                 mddev->safemode = 0;
4458                 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4459                 if (mddev->hold_active == UNTIL_STOP)
4460                         mddev->hold_active = 0;
4461
4462         } else if (mddev->pers)
4463                 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4464                         mdname(mddev));
4465         err = 0;
4466         blk_integrity_unregister(disk);
4467         md_new_event(mddev);
4468         sysfs_notify_dirent(mddev->sysfs_state);
4469         return err;
4470 }
4471
4472 #ifndef MODULE
4473 static void autorun_array(mddev_t *mddev)
4474 {
4475         mdk_rdev_t *rdev;
4476         int err;
4477
4478         if (list_empty(&mddev->disks))
4479                 return;
4480
4481         printk(KERN_INFO "md: running: ");
4482
4483         list_for_each_entry(rdev, &mddev->disks, same_set) {
4484                 char b[BDEVNAME_SIZE];
4485                 printk("<%s>", bdevname(rdev->bdev,b));
4486         }
4487         printk("\n");
4488
4489         err = do_md_run(mddev);
4490         if (err) {
4491                 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4492                 do_md_stop(mddev, 0, 0);
4493         }
4494 }
4495
4496 /*
4497  * lets try to run arrays based on all disks that have arrived
4498  * until now. (those are in pending_raid_disks)
4499  *
4500  * the method: pick the first pending disk, collect all disks with
4501  * the same UUID, remove all from the pending list and put them into
4502  * the 'same_array' list. Then order this list based on superblock
4503  * update time (freshest comes first), kick out 'old' disks and
4504  * compare superblocks. If everything's fine then run it.
4505  *
4506  * If "unit" is allocated, then bump its reference count
4507  */
4508 static void autorun_devices(int part)
4509 {
4510         mdk_rdev_t *rdev0, *rdev, *tmp;
4511         mddev_t *mddev;
4512         char b[BDEVNAME_SIZE];
4513
4514         printk(KERN_INFO "md: autorun ...\n");
4515         while (!list_empty(&pending_raid_disks)) {
4516                 int unit;
4517                 dev_t dev;
4518                 LIST_HEAD(candidates);
4519                 rdev0 = list_entry(pending_raid_disks.next,
4520                                          mdk_rdev_t, same_set);
4521
4522                 printk(KERN_INFO "md: considering %s ...\n",
4523                         bdevname(rdev0->bdev,b));
4524                 INIT_LIST_HEAD(&candidates);
4525                 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4526                         if (super_90_load(rdev, rdev0, 0) >= 0) {
4527                                 printk(KERN_INFO "md:  adding %s ...\n",
4528                                         bdevname(rdev->bdev,b));
4529                                 list_move(&rdev->same_set, &candidates);
4530                         }
4531                 /*
4532                  * now we have a set of devices, with all of them having
4533                  * mostly sane superblocks. It's time to allocate the
4534                  * mddev.
4535                  */
4536                 if (part) {
4537                         dev = MKDEV(mdp_major,
4538                                     rdev0->preferred_minor << MdpMinorShift);
4539                         unit = MINOR(dev) >> MdpMinorShift;
4540                 } else {
4541                         dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4542                         unit = MINOR(dev);
4543                 }
4544                 if (rdev0->preferred_minor != unit) {
4545                         printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4546                                bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4547                         break;
4548                 }
4549
4550                 md_probe(dev, NULL, NULL);
4551                 mddev = mddev_find(dev);
4552                 if (!mddev || !mddev->gendisk) {
4553                         if (mddev)
4554                                 mddev_put(mddev);
4555                         printk(KERN_ERR
4556                                 "md: cannot allocate memory for md drive.\n");
4557                         break;
4558                 }
4559                 if (mddev_lock(mddev))
4560                         printk(KERN_WARNING "md: %s locked, cannot run\n",
4561                                mdname(mddev));
4562                 else if (mddev->raid_disks || mddev->major_version
4563                          || !list_empty(&mddev->disks)) {
4564                         printk(KERN_WARNING
4565                                 "md: %s already running, cannot run %s\n",
4566                                 mdname(mddev), bdevname(rdev0->bdev,b));
4567                         mddev_unlock(mddev);
4568                 } else {
4569                         printk(KERN_INFO "md: created %s\n", mdname(mddev));
4570                         mddev->persistent = 1;
4571                         rdev_for_each_list(rdev, tmp, &candidates) {
4572                                 list_del_init(&rdev->same_set);
4573                                 if (bind_rdev_to_array(rdev, mddev))
4574                                         export_rdev(rdev);
4575                         }
4576                         autorun_array(mddev);
4577                         mddev_unlock(mddev);
4578                 }
4579                 /* on success, candidates will be empty, on error
4580                  * it won't...
4581                  */
4582                 rdev_for_each_list(rdev, tmp, &candidates) {
4583                         list_del_init(&rdev->same_set);
4584                         export_rdev(rdev);
4585                 }
4586                 mddev_put(mddev);
4587         }
4588         printk(KERN_INFO "md: ... autorun DONE.\n");
4589 }
4590 #endif /* !MODULE */
4591
4592 static int get_version(void __user * arg)
4593 {
4594         mdu_version_t ver;
4595
4596         ver.major = MD_MAJOR_VERSION;
4597         ver.minor = MD_MINOR_VERSION;
4598         ver.patchlevel = MD_PATCHLEVEL_VERSION;
4599
4600         if (copy_to_user(arg, &ver, sizeof(ver)))
4601                 return -EFAULT;
4602
4603         return 0;
4604 }
4605
4606 static int get_array_info(mddev_t * mddev, void __user * arg)
4607 {
4608         mdu_array_info_t info;
4609         int nr,working,insync,failed,spare;
4610         mdk_rdev_t *rdev;
4611
4612         nr=working=insync=failed=spare=0;
4613         list_for_each_entry(rdev, &mddev->disks, same_set) {
4614                 nr++;
4615                 if (test_bit(Faulty, &rdev->flags))
4616                         failed++;
4617                 else {
4618                         working++;
4619                         if (test_bit(In_sync, &rdev->flags))
4620                                 insync++;
4621                         else
4622                                 spare++;
4623                 }
4624         }
4625
4626         info.major_version = mddev->major_version;
4627         info.minor_version = mddev->minor_version;
4628         info.patch_version = MD_PATCHLEVEL_VERSION;
4629         info.ctime         = mddev->ctime;
4630         info.level         = mddev->level;
4631         info.size          = mddev->dev_sectors / 2;
4632         if (info.size != mddev->dev_sectors / 2) /* overflow */
4633                 info.size = -1;
4634         info.nr_disks      = nr;
4635         info.raid_disks    = mddev->raid_disks;
4636         info.md_minor      = mddev->md_minor;
4637         info.not_persistent= !mddev->persistent;
4638
4639         info.utime         = mddev->utime;
4640         info.state         = 0;
4641         if (mddev->in_sync)
4642                 info.state = (1<<MD_SB_CLEAN);
4643         if (mddev->bitmap && mddev->bitmap_offset)
4644                 info.state = (1<<MD_SB_BITMAP_PRESENT);
4645         info.active_disks  = insync;
4646         info.working_disks = working;
4647         info.failed_disks  = failed;
4648         info.spare_disks   = spare;
4649
4650         info.layout        = mddev->layout;
4651         info.chunk_size    = mddev->chunk_sectors << 9;
4652
4653         if (copy_to_user(arg, &info, sizeof(info)))
4654                 return -EFAULT;
4655
4656         return 0;
4657 }
4658
4659 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4660 {
4661         mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4662         char *ptr, *buf = NULL;
4663         int err = -ENOMEM;
4664
4665         if (md_allow_write(mddev))
4666                 file = kmalloc(sizeof(*file), GFP_NOIO);
4667         else
4668                 file = kmalloc(sizeof(*file), GFP_KERNEL);
4669
4670         if (!file)
4671                 goto out;
4672
4673         /* bitmap disabled, zero the first byte and copy out */
4674         if (!mddev->bitmap || !mddev->bitmap->file) {
4675                 file->pathname[0] = '\0';
4676                 goto copy_out;
4677         }
4678
4679         buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4680         if (!buf)
4681                 goto out;
4682
4683         ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4684         if (IS_ERR(ptr))
4685                 goto out;
4686
4687         strcpy(file->pathname, ptr);
4688
4689 copy_out:
4690         err = 0;
4691         if (copy_to_user(arg, file, sizeof(*file)))
4692                 err = -EFAULT;
4693 out:
4694         kfree(buf);
4695         kfree(file);
4696         return err;
4697 }
4698
4699 static int get_disk_info(mddev_t * mddev, void __user * arg)
4700 {
4701         mdu_disk_info_t info;
4702         mdk_rdev_t *rdev;
4703
4704         if (copy_from_user(&info, arg, sizeof(info)))
4705                 return -EFAULT;
4706
4707         rdev = find_rdev_nr(mddev, info.number);
4708         if (rdev) {
4709                 info.major = MAJOR(rdev->bdev->bd_dev);
4710                 info.minor = MINOR(rdev->bdev->bd_dev);
4711                 info.raid_disk = rdev->raid_disk;
4712                 info.state = 0;
4713                 if (test_bit(Faulty, &rdev->flags))
4714                         info.state |= (1<<MD_DISK_FAULTY);
4715                 else if (test_bit(In_sync, &rdev->flags)) {
4716                         info.state |= (1<<MD_DISK_ACTIVE);
4717                         info.state |= (1<<MD_DISK_SYNC);
4718                 }
4719                 if (test_bit(WriteMostly, &rdev->flags))
4720                         info.state |= (1<<MD_DISK_WRITEMOSTLY);
4721         } else {
4722                 info.major = info.minor = 0;
4723                 info.raid_disk = -1;
4724                 info.state = (1<<MD_DISK_REMOVED);
4725         }
4726
4727         if (copy_to_user(arg, &info, sizeof(info)))
4728                 return -EFAULT;
4729
4730         return 0;
4731 }
4732
4733 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4734 {
4735         char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4736         mdk_rdev_t *rdev;
4737         dev_t dev = MKDEV(info->major,info->minor);
4738
4739         if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4740                 return -EOVERFLOW;
4741
4742         if (!mddev->raid_disks) {
4743                 int err;
4744                 /* expecting a device which has a superblock */
4745                 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4746                 if (IS_ERR(rdev)) {
4747                         printk(KERN_WARNING
4748                                 "md: md_import_device returned %ld\n",
4749                                 PTR_ERR(rdev));
4750                         return PTR_ERR(rdev);
4751                 }
4752                 if (!list_empty(&mddev->disks)) {
4753                         mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4754                                                         mdk_rdev_t, same_set);
4755                         err = super_types[mddev->major_version]
4756                                 .load_super(rdev, rdev0, mddev->minor_version);
4757                         if (err < 0) {
4758                                 printk(KERN_WARNING
4759                                         "md: %s has different UUID to %s\n",
4760                                         bdevname(rdev->bdev,b),
4761                                         bdevname(rdev0->bdev,b2));
4762                                 export_rdev(rdev);
4763                                 return -EINVAL;
4764                         }
4765                 }
4766                 err = bind_rdev_to_array(rdev, mddev);
4767                 if (err)
4768                         export_rdev(rdev);
4769                 return err;
4770         }
4771
4772         /*
4773          * add_new_disk can be used once the array is assembled
4774          * to add "hot spares".  They must already have a superblock
4775          * written
4776          */
4777         if (mddev->pers) {
4778                 int err;
4779                 if (!mddev->pers->hot_add_disk) {
4780                         printk(KERN_WARNING
4781                                 "%s: personality does not support diskops!\n",
4782                                mdname(mddev));
4783                         return -EINVAL;
4784                 }
4785                 if (mddev->persistent)
4786                         rdev = md_import_device(dev, mddev->major_version,
4787                                                 mddev->minor_version);
4788                 else
4789                         rdev = md_import_device(dev, -1, -1);
4790                 if (IS_ERR(rdev)) {
4791                         printk(KERN_WARNING
4792                                 "md: md_import_device returned %ld\n",
4793                                 PTR_ERR(rdev));
4794                         return PTR_ERR(rdev);
4795                 }
4796                 /* set save_raid_disk if appropriate */
4797                 if (!mddev->persistent) {
4798                         if (info->state & (1<<MD_DISK_SYNC)  &&
4799                             info->raid_disk < mddev->raid_disks)
4800                                 rdev->raid_disk = info->raid_disk;
4801                         else
4802                                 rdev->raid_disk = -1;
4803                 } else
4804                         super_types[mddev->major_version].
4805                                 validate_super(mddev, rdev);
4806                 rdev->saved_raid_disk = rdev->raid_disk;
4807
4808                 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4809                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4810                         set_bit(WriteMostly, &rdev->flags);
4811                 else
4812                         clear_bit(WriteMostly, &rdev->flags);
4813
4814                 rdev->raid_disk = -1;
4815                 err = bind_rdev_to_array(rdev, mddev);
4816                 if (!err && !mddev->pers->hot_remove_disk) {
4817                         /* If there is hot_add_disk but no hot_remove_disk
4818                          * then added disks for geometry changes,
4819                          * and should be added immediately.
4820                          */
4821                         super_types[mddev->major_version].
4822                                 validate_super(mddev, rdev);
4823                         err = mddev->pers->hot_add_disk(mddev, rdev);
4824                         if (err)
4825                                 unbind_rdev_from_array(rdev);
4826                 }
4827                 if (err)
4828                         export_rdev(rdev);
4829                 else
4830                         sysfs_notify_dirent(rdev->sysfs_state);
4831
4832                 md_update_sb(mddev, 1);
4833                 if (mddev->degraded)
4834                         set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4835                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4836                 md_wakeup_thread(mddev->thread);
4837                 return err;
4838         }
4839
4840         /* otherwise, add_new_disk is only allowed
4841          * for major_version==0 superblocks
4842          */
4843         if (mddev->major_version != 0) {
4844                 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4845                        mdname(mddev));
4846                 return -EINVAL;
4847         }
4848
4849         if (!(info->state & (1<<MD_DISK_FAULTY))) {
4850                 int err;
4851                 rdev = md_import_device(dev, -1, 0);
4852                 if (IS_ERR(rdev)) {
4853                         printk(KERN_WARNING
4854                                 "md: error, md_import_device() returned %ld\n",
4855                                 PTR_ERR(rdev));
4856                         return PTR_ERR(rdev);
4857                 }
4858                 rdev->desc_nr = info->number;
4859                 if (info->raid_disk < mddev->raid_disks)
4860                         rdev->raid_disk = info->raid_disk;
4861                 else
4862                         rdev->raid_disk = -1;
4863
4864                 if (rdev->raid_disk < mddev->raid_disks)
4865                         if (info->state & (1<<MD_DISK_SYNC))
4866                                 set_bit(In_sync, &rdev->flags);
4867
4868                 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4869                         set_bit(WriteMostly, &rdev->flags);
4870
4871                 if (!mddev->persistent) {
4872                         printk(KERN_INFO "md: nonpersistent superblock ...\n");
4873                         rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4874                 } else
4875                         rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4876                 rdev->sectors = rdev->sb_start;
4877
4878                 err = bind_rdev_to_array(rdev, mddev);
4879                 if (err) {
4880                         export_rdev(rdev);
4881                         return err;
4882                 }
4883         }
4884
4885         return 0;
4886 }
4887
4888 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4889 {
4890         char b[BDEVNAME_SIZE];
4891         mdk_rdev_t *rdev;
4892
4893         rdev = find_rdev(mddev, dev);
4894         if (!rdev)
4895                 return -ENXIO;
4896
4897         if (rdev->raid_disk >= 0)
4898                 goto busy;
4899
4900         kick_rdev_from_array(rdev);
4901         md_update_sb(mddev, 1);
4902         md_new_event(mddev);
4903
4904         return 0;
4905 busy:
4906         printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4907                 bdevname(rdev->bdev,b), mdname(mddev));
4908         return -EBUSY;
4909 }
4910
4911 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4912 {
4913         char b[BDEVNAME_SIZE];
4914         int err;
4915         mdk_rdev_t *rdev;
4916
4917         if (!mddev->pers)
4918                 return -ENODEV;
4919
4920         if (mddev->major_version != 0) {
4921                 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4922                         " version-0 superblocks.\n",
4923                         mdname(mddev));
4924                 return -EINVAL;
4925         }
4926         if (!mddev->pers->hot_add_disk) {
4927                 printk(KERN_WARNING
4928                         "%s: personality does not support diskops!\n",
4929                         mdname(mddev));
4930                 return -EINVAL;
4931         }
4932
4933         rdev = md_import_device(dev, -1, 0);
4934         if (IS_ERR(rdev)) {
4935                 printk(KERN_WARNING
4936                         "md: error, md_import_device() returned %ld\n",
4937                         PTR_ERR(rdev));
4938                 return -EINVAL;
4939         }
4940
4941         if (mddev->persistent)
4942                 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4943         else
4944                 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4945
4946         rdev->sectors = rdev->sb_start;
4947
4948         if (test_bit(Faulty, &rdev->flags)) {
4949                 printk(KERN_WARNING
4950                         "md: can not hot-add faulty %s disk to %s!\n",
4951                         bdevname(rdev->bdev,b), mdname(mddev));
4952                 err = -EINVAL;
4953                 goto abort_export;
4954         }
4955         clear_bit(In_sync, &rdev->flags);
4956         rdev->desc_nr = -1;
4957         rdev->saved_raid_disk = -1;
4958         err = bind_rdev_to_array(rdev, mddev);
4959         if (err)
4960                 goto abort_export;
4961
4962         /*
4963          * The rest should better be atomic, we can have disk failures
4964          * noticed in interrupt contexts ...
4965          */
4966
4967         rdev->raid_disk = -1;
4968
4969         md_update_sb(mddev, 1);
4970
4971         /*
4972          * Kick recovery, maybe this spare has to be added to the
4973          * array immediately.
4974          */
4975         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4976         md_wakeup_thread(mddev->thread);
4977         md_new_event(mddev);
4978         return 0;
4979
4980 abort_export:
4981         export_rdev(rdev);
4982         return err;
4983 }
4984
4985 static int set_bitmap_file(mddev_t *mddev, int fd)
4986 {
4987         int err;
4988
4989         if (mddev->pers) {
4990                 if (!mddev->pers->quiesce)
4991                         return -EBUSY;
4992                 if (mddev->recovery || mddev->sync_thread)
4993                         return -EBUSY;
4994                 /* we should be able to change the bitmap.. */
4995         }
4996
4997
4998         if (fd >= 0) {
4999                 if (mddev->bitmap)
5000                         return -EEXIST; /* cannot add when bitmap is present */
5001                 mddev->bitmap_file = fget(fd);
5002
5003                 if (mddev->bitmap_file == NULL) {
5004                         printk(KERN_ERR "%s: error: failed to get bitmap file\n",
5005                                mdname(mddev));
5006                         return -EBADF;
5007                 }
5008
5009                 err = deny_bitmap_write_access(mddev->bitmap_file);
5010                 if (err) {
5011                         printk(KERN_ERR "%s: error: bitmap file is already in use\n",
5012                                mdname(mddev));
5013                         fput(mddev->bitmap_file);
5014                         mddev->bitmap_file = NULL;
5015                         return err;
5016                 }
5017                 mddev->bitmap_offset = 0; /* file overrides offset */
5018         } else if (mddev->bitmap == NULL)
5019                 return -ENOENT; /* cannot remove what isn't there */
5020         err = 0;
5021         if (mddev->pers) {
5022                 mddev->pers->quiesce(mddev, 1);
5023                 if (fd >= 0)
5024                         err = bitmap_create(mddev);
5025                 if (fd < 0 || err) {
5026                         bitmap_destroy(mddev);
5027                         fd = -1; /* make sure to put the file */
5028                 }
5029                 mddev->pers->quiesce(mddev, 0);
5030         }
5031         if (fd < 0) {
5032                 if (mddev->bitmap_file) {
5033                         restore_bitmap_write_access(mddev->bitmap_file);
5034                         fput(mddev->bitmap_file);
5035                 }
5036                 mddev->bitmap_file = NULL;
5037         }
5038
5039         return err;
5040 }
5041
5042 /*
5043  * set_array_info is used two different ways
5044  * The original usage is when creating a new array.
5045  * In this usage, raid_disks is > 0 and it together with
5046  *  level, size, not_persistent,layout,chunksize determine the
5047  *  shape of the array.
5048  *  This will always create an array with a type-0.90.0 superblock.
5049  * The newer usage is when assembling an array.
5050  *  In this case raid_disks will be 0, and the major_version field is
5051  *  use to determine which style super-blocks are to be found on the devices.
5052  *  The minor and patch _version numbers are also kept incase the
5053  *  super_block handler wishes to interpret them.
5054  */
5055 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
5056 {
5057
5058         if (info->raid_disks == 0) {
5059                 /* just setting version number for superblock loading */
5060                 if (info->major_version < 0 ||
5061                     info->major_version >= ARRAY_SIZE(super_types) ||
5062                     super_types[info->major_version].name == NULL) {
5063                         /* maybe try to auto-load a module? */
5064                         printk(KERN_INFO
5065                                 "md: superblock version %d not known\n",
5066                                 info->major_version);
5067                         return -EINVAL;
5068                 }
5069                 mddev->major_version = info->major_version;
5070                 mddev->minor_version = info->minor_version;
5071                 mddev->patch_version = info->patch_version;
5072                 mddev->persistent = !info->not_persistent;
5073                 return 0;
5074         }
5075         mddev->major_version = MD_MAJOR_VERSION;
5076         mddev->minor_version = MD_MINOR_VERSION;
5077         mddev->patch_version = MD_PATCHLEVEL_VERSION;
5078         mddev->ctime         = get_seconds();
5079
5080         mddev->level         = info->level;
5081         mddev->clevel[0]     = 0;
5082         mddev->dev_sectors   = 2 * (sector_t)info->size;
5083         mddev->raid_disks    = info->raid_disks;
5084         /* don't set md_minor, it is determined by which /dev/md* was
5085          * openned
5086          */
5087         if (info->state & (1<<MD_SB_CLEAN))
5088                 mddev->recovery_cp = MaxSector;
5089         else
5090                 mddev->recovery_cp = 0;
5091         mddev->persistent    = ! info->not_persistent;
5092         mddev->external      = 0;
5093
5094         mddev->layout        = info->layout;
5095         mddev->chunk_sectors = info->chunk_size >> 9;
5096
5097         mddev->max_disks     = MD_SB_DISKS;
5098
5099         if (mddev->persistent)
5100                 mddev->flags         = 0;
5101         set_bit(MD_CHANGE_DEVS, &mddev->flags);
5102
5103         mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
5104         mddev->bitmap_offset = 0;
5105
5106         mddev->reshape_position = MaxSector;
5107
5108         /*
5109          * Generate a 128 bit UUID
5110          */
5111         get_random_bytes(mddev->uuid, 16);
5112
5113         mddev->new_level = mddev->level;
5114         mddev->new_chunk_sectors = mddev->chunk_sectors;
5115         mddev->new_layout = mddev->layout;
5116         mddev->delta_disks = 0;
5117
5118         return 0;
5119 }
5120
5121 void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors)
5122 {
5123         WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__);
5124
5125         if (mddev->external_size)
5126                 return;
5127
5128         mddev->array_sectors = array_sectors;
5129 }
5130 EXPORT_SYMBOL(md_set_array_sectors);
5131
5132 static int update_size(mddev_t *mddev, sector_t num_sectors)
5133 {
5134         mdk_rdev_t *rdev;
5135         int rv;
5136         int fit = (num_sectors == 0);
5137
5138         if (mddev->pers->resize == NULL)
5139                 return -EINVAL;
5140         /* The "num_sectors" is the number of sectors of each device that
5141          * is used.  This can only make sense for arrays with redundancy.
5142          * linear and raid0 always use whatever space is available. We can only
5143          * consider changing this number if no resync or reconstruction is
5144          * happening, and if the new size is acceptable. It must fit before the
5145          * sb_start or, if that is <data_offset, it must fit before the size
5146          * of each device.  If num_sectors is zero, we find the largest size
5147          * that fits.
5148
5149          */
5150         if (mddev->sync_thread)
5151                 return -EBUSY;
5152         if (mddev->bitmap)
5153                 /* Sorry, cannot grow a bitmap yet, just remove it,
5154                  * grow, and re-add.
5155                  */
5156                 return -EBUSY;
5157         list_for_each_entry(rdev, &mddev->disks, same_set) {
5158                 sector_t avail = rdev->sectors;
5159
5160                 if (fit && (num_sectors == 0 || num_sectors > avail))
5161                         num_sectors = avail;
5162                 if (avail < num_sectors)
5163                         return -ENOSPC;
5164         }
5165         rv = mddev->pers->resize(mddev, num_sectors);
5166         if (!rv)
5167                 revalidate_disk(mddev->gendisk);
5168         return rv;
5169 }
5170
5171 static int update_raid_disks(mddev_t *mddev, int raid_disks)
5172 {
5173         int rv;
5174         /* change the number of raid disks */
5175         if (mddev->pers->check_reshape == NULL)
5176                 return -EINVAL;
5177         if (raid_disks <= 0 ||
5178             raid_disks >= mddev->max_disks)
5179                 return -EINVAL;
5180         if (mddev->sync_thread || mddev->reshape_position != MaxSector)
5181                 return -EBUSY;
5182         mddev->delta_disks = raid_disks - mddev->raid_disks;
5183
5184         rv = mddev->pers->check_reshape(mddev);
5185         return rv;
5186 }
5187
5188
5189 /*
5190  * update_array_info is used to change the configuration of an
5191  * on-line array.
5192  * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
5193  * fields in the info are checked against the array.
5194  * Any differences that cannot be handled will cause an error.
5195  * Normally, only one change can be managed at a time.
5196  */
5197 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
5198 {
5199         int rv = 0;
5200         int cnt = 0;
5201         int state = 0;
5202
5203         /* calculate expected state,ignoring low bits */
5204         if (mddev->bitmap && mddev->bitmap_offset)
5205                 state |= (1 << MD_SB_BITMAP_PRESENT);
5206
5207         if (mddev->major_version != info->major_version ||
5208             mddev->minor_version != info->minor_version ||
5209 /*          mddev->patch_version != info->patch_version || */
5210             mddev->ctime         != info->ctime         ||
5211             mddev->level         != info->level         ||
5212 /*          mddev->layout        != info->layout        || */
5213             !mddev->persistent   != info->not_persistent||
5214             mddev->chunk_sectors != info->chunk_size >> 9 ||
5215             /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
5216             ((state^info->state) & 0xfffffe00)
5217                 )
5218                 return -EINVAL;
5219         /* Check there is only one change */
5220         if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5221                 cnt++;
5222         if (mddev->raid_disks != info->raid_disks)
5223                 cnt++;
5224         if (mddev->layout != info->layout)
5225                 cnt++;
5226         if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
5227                 cnt++;
5228         if (cnt == 0)
5229                 return 0;
5230         if (cnt > 1)
5231                 return -EINVAL;
5232
5233         if (mddev->layout != info->layout) {
5234                 /* Change layout
5235                  * we don't need to do anything at the md level, the
5236                  * personality will take care of it all.
5237                  */
5238                 if (mddev->pers->check_reshape == NULL)
5239                         return -EINVAL;
5240                 else {
5241                         mddev->new_layout = info->layout;
5242                         rv = mddev->pers->check_reshape(mddev);
5243                         if (rv)
5244                                 mddev->new_layout = mddev->layout;
5245                         return rv;
5246                 }
5247         }
5248         if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
5249                 rv = update_size(mddev, (sector_t)info->size * 2);
5250
5251         if (mddev->raid_disks    != info->raid_disks)
5252                 rv = update_raid_disks(mddev, info->raid_disks);
5253
5254         if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
5255                 if (mddev->pers->quiesce == NULL)
5256                         return -EINVAL;
5257                 if (mddev->recovery || mddev->sync_thread)
5258                         return -EBUSY;
5259                 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
5260                         /* add the bitmap */
5261                         if (mddev->bitmap)
5262                                 return -EEXIST;
5263                         if (mddev->default_bitmap_offset == 0)
5264                                 return -EINVAL;
5265                         mddev->bitmap_offset = mddev->default_bitmap_offset;
5266                         mddev->pers->quiesce(mddev, 1);
5267                         rv = bitmap_create(mddev);
5268                         if (rv)
5269                                 bitmap_destroy(mddev);
5270                         mddev->pers->quiesce(mddev, 0);
5271                 } else {
5272                         /* remove the bitmap */
5273                         if (!mddev->bitmap)
5274                                 return -ENOENT;
5275                         if (mddev->bitmap->file)
5276                                 return -EINVAL;
5277                         mddev->pers->quiesce(mddev, 1);
5278                         bitmap_destroy(mddev);
5279                         mddev->pers->quiesce(mddev, 0);
5280                         mddev->bitmap_offset = 0;
5281                 }
5282         }
5283         md_update_sb(mddev, 1);
5284         return rv;
5285 }
5286
5287 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
5288 {
5289         mdk_rdev_t *rdev;
5290
5291         if (mddev->pers == NULL)
5292                 return -ENODEV;
5293
5294         rdev = find_rdev(mddev, dev);
5295         if (!rdev)
5296                 return -ENODEV;
5297
5298         md_error(mddev, rdev);
5299         return 0;
5300 }
5301
5302 /*
5303  * We have a problem here : there is no easy way to give a CHS
5304  * virtual geometry. We currently pretend that we have a 2 heads
5305  * 4 sectors (with a BIG number of cylinders...). This drives
5306  * dosfs just mad... ;-)
5307  */
5308 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
5309 {
5310         mddev_t *mddev = bdev->bd_disk->private_data;
5311
5312         geo->heads = 2;
5313         geo->sectors = 4;
5314         geo->cylinders = get_capacity(mddev->gendisk) / 8;
5315         return 0;
5316 }
5317
5318 static int md_ioctl(struct block_device *bdev, fmode_t mode,
5319                         unsigned int cmd, unsigned long arg)
5320 {
5321         int err = 0;
5322         void __user *argp = (void __user *)arg;
5323         mddev_t *mddev = NULL;
5324
5325         if (!capable(CAP_SYS_ADMIN))
5326                 return -EACCES;
5327
5328         /*
5329          * Commands dealing with the RAID driver but not any
5330          * particular array:
5331          */
5332         switch (cmd)
5333         {
5334                 case RAID_VERSION:
5335                         err = get_version(argp);
5336                         goto done;
5337
5338                 case PRINT_RAID_DEBUG:
5339                         err = 0;
5340                         md_print_devices();
5341                         goto done;
5342
5343 #ifndef MODULE
5344                 case RAID_AUTORUN:
5345                         err = 0;
5346                         autostart_arrays(arg);
5347                         goto done;
5348 #endif
5349                 default:;
5350         }
5351
5352         /*
5353          * Commands creating/starting a new array:
5354          */
5355
5356         mddev = bdev->bd_disk->private_data;
5357
5358         if (!mddev) {
5359                 BUG();
5360                 goto abort;
5361         }
5362
5363         err = mddev_lock(mddev);
5364         if (err) {
5365                 printk(KERN_INFO
5366                         "md: ioctl lock interrupted, reason %d, cmd %d\n",
5367                         err, cmd);
5368                 goto abort;
5369         }
5370
5371         switch (cmd)
5372         {
5373                 case SET_ARRAY_INFO:
5374                         {
5375                                 mdu_array_info_t info;
5376                                 if (!arg)
5377                                         memset(&info, 0, sizeof(info));
5378                                 else if (copy_from_user(&info, argp, sizeof(info))) {
5379                                         err = -EFAULT;
5380                                         goto abort_unlock;
5381                                 }
5382                                 if (mddev->pers) {
5383                                         err = update_array_info(mddev, &info);
5384                                         if (err) {
5385                                                 printk(KERN_WARNING "md: couldn't update"
5386                                                        " array info. %d\n", err);
5387                                                 goto abort_unlock;
5388                                         }
5389                                         goto done_unlock;
5390                                 }
5391                                 if (!list_empty(&mddev->disks)) {
5392                                         printk(KERN_WARNING
5393                                                "md: array %s already has disks!\n",
5394                                                mdname(mddev));
5395                                         err = -EBUSY;
5396                                         goto abort_unlock;
5397                                 }
5398                                 if (mddev->raid_disks) {
5399                                         printk(KERN_WARNING
5400                                                "md: array %s already initialised!\n",
5401                                                mdname(mddev));
5402                                         err = -EBUSY;
5403                                         goto abort_unlock;
5404                                 }
5405                                 err = set_array_info(mddev, &info);
5406                                 if (err) {
5407                                         printk(KERN_WARNING "md: couldn't set"
5408                                                " array info. %d\n", err);
5409                                         goto abort_unlock;
5410                                 }
5411                         }
5412                         goto done_unlock;
5413
5414                 default:;
5415         }
5416
5417         /*
5418          * Commands querying/configuring an existing array:
5419          */
5420         /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
5421          * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
5422         if ((!mddev->raid_disks && !mddev->external)
5423             && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
5424             && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
5425             && cmd != GET_BITMAP_FILE) {
5426                 err = -ENODEV;
5427                 goto abort_unlock;
5428         }
5429
5430         /*
5431          * Commands even a read-only array can execute:
5432          */
5433         switch (cmd)
5434         {
5435                 case GET_ARRAY_INFO:
5436                         err = get_array_info(mddev, argp);
5437                         goto done_unlock;
5438
5439                 case GET_BITMAP_FILE:
5440                         err = get_bitmap_file(mddev, argp);
5441                         goto done_unlock;
5442
5443                 case GET_DISK_INFO:
5444                         err = get_disk_info(mddev, argp);
5445                         goto done_unlock;
5446
5447                 case RESTART_ARRAY_RW:
5448                         err = restart_array(mddev);
5449                         goto done_unlock;
5450
5451                 case STOP_ARRAY:
5452                         err = do_md_stop(mddev, 0, 1);
5453                         goto done_unlock;
5454
5455                 case STOP_ARRAY_RO:
5456                         err = do_md_stop(mddev, 1, 1);
5457                         goto done_unlock;
5458
5459         }
5460
5461         /*
5462          * The remaining ioctls are changing the state of the
5463          * superblock, so we do not allow them on read-only arrays.
5464          * However non-MD ioctls (e.g. get-size) will still come through
5465          * here and hit the 'default' below, so only disallow
5466          * 'md' ioctls, and switch to rw mode if started auto-readonly.
5467          */
5468         if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5469                 if (mddev->ro == 2) {
5470                         mddev->ro = 0;
5471                         sysfs_notify_dirent(mddev->sysfs_state);
5472                         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5473                         md_wakeup_thread(mddev->thread);
5474                 } else {
5475                         err = -EROFS;
5476                         goto abort_unlock;
5477                 }
5478         }
5479
5480         switch (cmd)
5481         {
5482                 case ADD_NEW_DISK:
5483                 {
5484                         mdu_disk_info_t info;
5485                         if (copy_from_user(&info, argp, sizeof(info)))
5486                                 err = -EFAULT;
5487                         else
5488                                 err = add_new_disk(mddev, &info);
5489                         goto done_unlock;
5490                 }
5491
5492                 case HOT_REMOVE_DISK:
5493                         err = hot_remove_disk(mddev, new_decode_dev(arg));
5494                         goto done_unlock;
5495
5496                 case HOT_ADD_DISK:
5497                         err = hot_add_disk(mddev, new_decode_dev(arg));
5498                         goto done_unlock;
5499
5500                 case SET_DISK_FAULTY:
5501                         err = set_disk_faulty(mddev, new_decode_dev(arg));
5502                         goto done_unlock;
5503
5504                 case RUN_ARRAY:
5505                         err = do_md_run(mddev);
5506                         goto done_unlock;
5507
5508                 case SET_BITMAP_FILE:
5509                         err = set_bitmap_file(mddev, (int)arg);
5510                         goto done_unlock;
5511
5512                 default:
5513                         err = -EINVAL;
5514                         goto abort_unlock;
5515         }
5516
5517 done_unlock:
5518 abort_unlock:
5519         if (mddev->hold_active == UNTIL_IOCTL &&
5520             err != -EINVAL)
5521                 mddev->hold_active = 0;
5522         mddev_unlock(mddev);
5523
5524         return err;
5525 done:
5526         if (err)
5527                 MD_BUG();
5528 abort:
5529         return err;
5530 }
5531
5532 static int md_open(struct block_device *bdev, fmode_t mode)
5533 {
5534         /*
5535          * Succeed if we can lock the mddev, which confirms that
5536          * it isn't being stopped right now.
5537          */
5538         mddev_t *mddev = mddev_find(bdev->bd_dev);
5539         int err;
5540
5541         if (mddev->gendisk != bdev->bd_disk) {
5542                 /* we are racing with mddev_put which is discarding this
5543                  * bd_disk.
5544                  */
5545                 mddev_put(mddev);
5546                 /* Wait until bdev->bd_disk is definitely gone */
5547                 flush_scheduled_work();
5548                 /* Then retry the open from the top */
5549                 return -ERESTARTSYS;
5550         }
5551         BUG_ON(mddev != bdev->bd_disk->private_data);
5552
5553         if ((err = mutex_lock_interruptible(&mddev->open_mutex)))
5554                 goto out;
5555
5556         err = 0;
5557         atomic_inc(&mddev->openers);
5558         mutex_unlock(&mddev->open_mutex);
5559
5560         check_disk_change(bdev);
5561  out:
5562         return err;
5563 }
5564
5565 static int md_release(struct gendisk *disk, fmode_t mode)
5566 {
5567         mddev_t *mddev = disk->private_data;
5568
5569         BUG_ON(!mddev);
5570         atomic_dec(&mddev->openers);
5571         mddev_put(mddev);
5572
5573         return 0;
5574 }
5575
5576 static int md_media_changed(struct gendisk *disk)
5577 {
5578         mddev_t *mddev = disk->private_data;
5579
5580         return mddev->changed;
5581 }
5582
5583 static int md_revalidate(struct gendisk *disk)
5584 {
5585         mddev_t *mddev = disk->private_data;
5586
5587         mddev->changed = 0;
5588         return 0;
5589 }
5590 static const struct block_device_operations md_fops =
5591 {
5592         .owner          = THIS_MODULE,
5593         .open           = md_open,
5594         .release        = md_release,
5595         .ioctl          = md_ioctl,
5596         .getgeo         = md_getgeo,
5597         .media_changed  = md_media_changed,
5598         .revalidate_disk= md_revalidate,
5599 };
5600
5601 static int md_thread(void * arg)
5602 {
5603         mdk_thread_t *thread = arg;
5604
5605         /*
5606          * md_thread is a 'system-thread', it's priority should be very
5607          * high. We avoid resource deadlocks individually in each
5608          * raid personality. (RAID5 does preallocation) We also use RR and
5609          * the very same RT priority as kswapd, thus we will never get
5610          * into a priority inversion deadlock.
5611          *
5612          * we definitely have to have equal or higher priority than
5613          * bdflush, otherwise bdflush will deadlock if there are too
5614          * many dirty RAID5 blocks.
5615          */
5616
5617         allow_signal(SIGKILL);
5618         while (!kthread_should_stop()) {
5619
5620                 /* We need to wait INTERRUPTIBLE so that
5621                  * we don't add to the load-average.
5622                  * That means we need to be sure no signals are
5623                  * pending
5624                  */
5625                 if (signal_pending(current))
5626                         flush_signals(current);
5627
5628                 wait_event_interruptible_timeout
5629                         (thread->wqueue,
5630                          test_bit(THREAD_WAKEUP, &thread->flags)
5631                          || kthread_should_stop(),
5632                          thread->timeout);
5633
5634                 clear_bit(THREAD_WAKEUP, &thread->flags);
5635
5636                 thread->run(thread->mddev);
5637         }
5638
5639         return 0;
5640 }
5641
5642 void md_wakeup_thread(mdk_thread_t *thread)
5643 {
5644         if (thread) {
5645                 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5646                 set_bit(THREAD_WAKEUP, &thread->flags);
5647                 wake_up(&thread->wqueue);
5648         }
5649 }
5650
5651 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5652                                  const char *name)
5653 {
5654         mdk_thread_t *thread;
5655
5656         thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5657         if (!thread)
5658                 return NULL;
5659
5660         init_waitqueue_head(&thread->wqueue);
5661
5662         thread->run = run;
5663         thread->mddev = mddev;
5664         thread->timeout = MAX_SCHEDULE_TIMEOUT;
5665         thread->tsk = kthread_run(md_thread, thread,
5666                                   "%s_%s",
5667                                   mdname(thread->mddev),
5668                                   name ?: mddev->pers->name);
5669         if (IS_ERR(thread->tsk)) {
5670                 kfree(thread);
5671                 return NULL;
5672         }
5673         return thread;
5674 }
5675
5676 void md_unregister_thread(mdk_thread_t *thread)
5677 {
5678         if (!thread)
5679                 return;
5680         dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5681
5682         kthread_stop(thread->tsk);
5683         kfree(thread);
5684 }
5685
5686 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5687 {
5688         if (!mddev) {
5689                 MD_BUG();
5690                 return;
5691         }
5692
5693         if (!rdev || test_bit(Faulty, &rdev->flags))
5694                 return;
5695
5696         if (mddev->external)
5697                 set_bit(Blocked, &rdev->flags);
5698 /*
5699         dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5700                 mdname(mddev),
5701                 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5702                 __builtin_return_address(0),__builtin_return_address(1),
5703                 __builtin_return_address(2),__builtin_return_address(3));
5704 */
5705         if (!mddev->pers)
5706                 return;
5707         if (!mddev->pers->error_handler)
5708                 return;
5709         mddev->pers->error_handler(mddev,rdev);
5710         if (mddev->degraded)
5711                 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5712         set_bit(StateChanged, &rdev->flags);
5713         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5714         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5715         md_wakeup_thread(mddev->thread);
5716         md_new_event_inintr(mddev);
5717 }
5718
5719 /* seq_file implementation /proc/mdstat */
5720
5721 static void status_unused(struct seq_file *seq)
5722 {
5723         int i = 0;
5724         mdk_rdev_t *rdev;
5725
5726         seq_printf(seq, "unused devices: ");
5727
5728         list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5729                 char b[BDEVNAME_SIZE];
5730                 i++;
5731                 seq_printf(seq, "%s ",
5732                               bdevname(rdev->bdev,b));
5733         }
5734         if (!i)
5735                 seq_printf(seq, "<none>");
5736
5737         seq_printf(seq, "\n");
5738 }
5739
5740
5741 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5742 {
5743         sector_t max_sectors, resync, res;
5744         unsigned long dt, db;
5745         sector_t rt;
5746         int scale;
5747         unsigned int per_milli;
5748
5749         resync = mddev->curr_resync - atomic_read(&mddev->recovery_active);
5750
5751         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5752                 max_sectors = mddev->resync_max_sectors;
5753         else
5754                 max_sectors = mddev->dev_sectors;
5755
5756         /*
5757          * Should not happen.
5758          */
5759         if (!max_sectors) {
5760                 MD_BUG();
5761                 return;
5762         }
5763         /* Pick 'scale' such that (resync>>scale)*1000 will fit
5764          * in a sector_t, and (max_sectors>>scale) will fit in a
5765          * u32, as those are the requirements for sector_div.
5766          * Thus 'scale' must be at least 10
5767          */
5768         scale = 10;
5769         if (sizeof(sector_t) > sizeof(unsigned long)) {
5770                 while ( max_sectors/2 > (1ULL<<(scale+32)))
5771                         scale++;
5772         }
5773         res = (resync>>scale)*1000;
5774         sector_div(res, (u32)((max_sectors>>scale)+1));
5775
5776         per_milli = res;
5777         {
5778                 int i, x = per_milli/50, y = 20-x;
5779                 seq_printf(seq, "[");
5780                 for (i = 0; i < x; i++)
5781                         seq_printf(seq, "=");
5782                 seq_printf(seq, ">");
5783                 for (i = 0; i < y; i++)
5784                         seq_printf(seq, ".");
5785                 seq_printf(seq, "] ");
5786         }
5787         seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5788                    (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5789                     "reshape" :
5790                     (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5791                      "check" :
5792                      (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5793                       "resync" : "recovery"))),
5794                    per_milli/10, per_milli % 10,
5795                    (unsigned long long) resync/2,
5796                    (unsigned long long) max_sectors/2);
5797
5798         /*
5799          * dt: time from mark until now
5800          * db: blocks written from mark until now
5801          * rt: remaining time
5802          *
5803          * rt is a sector_t, so could be 32bit or 64bit.
5804          * So we divide before multiply in case it is 32bit and close
5805          * to the limit.
5806          * We scale the divisor (db) by 32 to avoid loosing precision
5807          * near the end of resync when the number of remaining sectors
5808          * is close to 'db'.
5809          * We then divide rt by 32 after multiplying by db to compensate.
5810          * The '+1' avoids division by zero if db is very small.
5811          */
5812         dt = ((jiffies - mddev->resync_mark) / HZ);
5813         if (!dt) dt++;
5814         db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5815                 - mddev->resync_mark_cnt;
5816
5817         rt = max_sectors - resync;    /* number of remaining sectors */
5818         sector_div(rt, db/32+1);
5819         rt *= dt;
5820         rt >>= 5;
5821
5822         seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
5823                    ((unsigned long)rt % 60)/6);
5824
5825         seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5826 }
5827
5828 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5829 {
5830         struct list_head *tmp;
5831         loff_t l = *pos;
5832         mddev_t *mddev;
5833
5834         if (l >= 0x10000)
5835                 return NULL;
5836         if (!l--)
5837                 /* header */
5838                 return (void*)1;
5839
5840         spin_lock(&all_mddevs_lock);
5841         list_for_each(tmp,&all_mddevs)
5842                 if (!l--) {
5843                         mddev = list_entry(tmp, mddev_t, all_mddevs);
5844                         mddev_get(mddev);
5845                         spin_unlock(&all_mddevs_lock);
5846                         return mddev;
5847                 }
5848         spin_unlock(&all_mddevs_lock);
5849         if (!l--)
5850                 return (void*)2;/* tail */
5851         return NULL;
5852 }
5853
5854 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5855 {
5856         struct list_head *tmp;
5857         mddev_t *next_mddev, *mddev = v;
5858
5859         ++*pos;
5860         if (v == (void*)2)
5861                 return NULL;
5862
5863         spin_lock(&all_mddevs_lock);
5864         if (v == (void*)1)
5865                 tmp = all_mddevs.next;
5866         else
5867                 tmp = mddev->all_mddevs.next;
5868         if (tmp != &all_mddevs)
5869                 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5870         else {
5871                 next_mddev = (void*)2;
5872                 *pos = 0x10000;
5873         }
5874         spin_unlock(&all_mddevs_lock);
5875
5876         if (v != (void*)1)
5877                 mddev_put(mddev);
5878         return next_mddev;
5879
5880 }
5881
5882 static void md_seq_stop(struct seq_file *seq, void *v)
5883 {
5884         mddev_t *mddev = v;
5885
5886         if (mddev && v != (void*)1 && v != (void*)2)
5887                 mddev_put(mddev);
5888 }
5889
5890 struct mdstat_info {
5891         int event;
5892 };
5893
5894 static int md_seq_show(struct seq_file *seq, void *v)
5895 {
5896         mddev_t *mddev = v;
5897         sector_t sectors;
5898         mdk_rdev_t *rdev;
5899         struct mdstat_info *mi = seq->private;
5900         struct bitmap *bitmap;
5901
5902         if (v == (void*)1) {
5903                 struct mdk_personality *pers;
5904                 seq_printf(seq, "Personalities : ");
5905                 spin_lock(&pers_lock);
5906                 list_for_each_entry(pers, &pers_list, list)
5907                         seq_printf(seq, "[%s] ", pers->name);
5908
5909                 spin_unlock(&pers_lock);
5910                 seq_printf(seq, "\n");
5911                 mi->event = atomic_read(&md_event_count);
5912                 return 0;
5913         }
5914         if (v == (void*)2) {
5915                 status_unused(seq);
5916                 return 0;
5917         }
5918
5919         if (mddev_lock(mddev) < 0)
5920                 return -EINTR;
5921
5922         if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5923                 seq_printf(seq, "%s : %sactive", mdname(mddev),
5924                                                 mddev->pers ? "" : "in");
5925                 if (mddev->pers) {
5926                         if (mddev->ro==1)
5927                                 seq_printf(seq, " (read-only)");
5928                         if (mddev->ro==2)
5929                                 seq_printf(seq, " (auto-read-only)");
5930                         seq_printf(seq, " %s", mddev->pers->name);
5931                 }
5932
5933                 sectors = 0;
5934                 list_for_each_entry(rdev, &mddev->disks, same_set) {
5935                         char b[BDEVNAME_SIZE];
5936                         seq_printf(seq, " %s[%d]",
5937                                 bdevname(rdev->bdev,b), rdev->desc_nr);
5938                         if (test_bit(WriteMostly, &rdev->flags))
5939                                 seq_printf(seq, "(W)");
5940                         if (test_bit(Faulty, &rdev->flags)) {
5941                                 seq_printf(seq, "(F)");
5942                                 continue;
5943                         } else if (rdev->raid_disk < 0)
5944                                 seq_printf(seq, "(S)"); /* spare */
5945                         sectors += rdev->sectors;
5946                 }
5947
5948                 if (!list_empty(&mddev->disks)) {
5949                         if (mddev->pers)
5950                                 seq_printf(seq, "\n      %llu blocks",
5951                                            (unsigned long long)
5952                                            mddev->array_sectors / 2);
5953                         else
5954                                 seq_printf(seq, "\n      %llu blocks",
5955                                            (unsigned long long)sectors / 2);
5956                 }
5957                 if (mddev->persistent) {
5958                         if (mddev->major_version != 0 ||
5959                             mddev->minor_version != 90) {
5960                                 seq_printf(seq," super %d.%d",
5961                                            mddev->major_version,
5962                                            mddev->minor_version);
5963                         }
5964                 } else if (mddev->external)
5965                         seq_printf(seq, " super external:%s",
5966                                    mddev->metadata_type);
5967                 else
5968                         seq_printf(seq, " super non-persistent");
5969
5970                 if (mddev->pers) {
5971                         mddev->pers->status(seq, mddev);
5972                         seq_printf(seq, "\n      ");
5973                         if (mddev->pers->sync_request) {
5974                                 if (mddev->curr_resync > 2) {
5975                                         status_resync(seq, mddev);
5976                                         seq_printf(seq, "\n      ");
5977                                 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5978                                         seq_printf(seq, "\tresync=DELAYED\n      ");
5979                                 else if (mddev->recovery_cp < MaxSector)
5980                                         seq_printf(seq, "\tresync=PENDING\n      ");
5981                         }
5982                 } else
5983                         seq_printf(seq, "\n       ");
5984
5985                 if ((bitmap = mddev->bitmap)) {
5986                         unsigned long chunk_kb;
5987                         unsigned long flags;
5988                         spin_lock_irqsave(&bitmap->lock, flags);
5989                         chunk_kb = bitmap->chunksize >> 10;
5990                         seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5991                                 "%lu%s chunk",
5992                                 bitmap->pages - bitmap->missing_pages,
5993                                 bitmap->pages,
5994                                 (bitmap->pages - bitmap->missing_pages)
5995                                         << (PAGE_SHIFT - 10),
5996                                 chunk_kb ? chunk_kb : bitmap->chunksize,
5997                                 chunk_kb ? "KB" : "B");
5998                         if (bitmap->file) {
5999                                 seq_printf(seq, ", file: ");
6000                                 seq_path(seq, &bitmap->file->f_path, " \t\n");
6001                         }
6002
6003                         seq_printf(seq, "\n");
6004                         spin_unlock_irqrestore(&bitmap->lock, flags);
6005                 }
6006
6007                 seq_printf(seq, "\n");
6008         }
6009         mddev_unlock(mddev);
6010
6011         return 0;
6012 }
6013
6014 static const struct seq_operations md_seq_ops = {
6015         .start  = md_seq_start,
6016         .next   = md_seq_next,
6017         .stop   = md_seq_stop,
6018         .show   = md_seq_show,
6019 };
6020
6021 static int md_seq_open(struct inode *inode, struct file *file)
6022 {
6023         int error;
6024         struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
6025         if (mi == NULL)
6026                 return -ENOMEM;
6027
6028         error = seq_open(file, &md_seq_ops);
6029         if (error)
6030                 kfree(mi);
6031         else {
6032                 struct seq_file *p = file->private_data;
6033                 p->private = mi;
6034                 mi->event = atomic_read(&md_event_count);
6035         }
6036         return error;
6037 }
6038
6039 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
6040 {
6041         struct seq_file *m = filp->private_data;
6042         struct mdstat_info *mi = m->private;
6043         int mask;
6044
6045         poll_wait(filp, &md_event_waiters, wait);
6046
6047         /* always allow read */
6048         mask = POLLIN | POLLRDNORM;
6049
6050         if (mi->event != atomic_read(&md_event_count))
6051                 mask |= POLLERR | POLLPRI;
6052         return mask;
6053 }
6054
6055 static const struct file_operations md_seq_fops = {
6056         .owner          = THIS_MODULE,
6057         .open           = md_seq_open,
6058         .read           = seq_read,
6059         .llseek         = seq_lseek,
6060         .release        = seq_release_private,
6061         .poll           = mdstat_poll,
6062 };
6063
6064 int register_md_personality(struct mdk_personality *p)
6065 {
6066         spin_lock(&pers_lock);
6067         list_add_tail(&p->list, &pers_list);
6068         printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
6069         spin_unlock(&pers_lock);
6070         return 0;
6071 }
6072
6073 int unregister_md_personality(struct mdk_personality *p)
6074 {
6075         printk(KERN_INFO "md: %s personality unregistered\n", p->name);
6076         spin_lock(&pers_lock);
6077         list_del_init(&p->list);
6078         spin_unlock(&pers_lock);
6079         return 0;
6080 }
6081
6082 static int is_mddev_idle(mddev_t *mddev, int init)
6083 {
6084         mdk_rdev_t * rdev;
6085         int idle;
6086         int curr_events;
6087
6088         idle = 1;
6089         rcu_read_lock();
6090         rdev_for_each_rcu(rdev, mddev) {
6091                 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
6092                 curr_events = (int)part_stat_read(&disk->part0, sectors[0]) +
6093                               (int)part_stat_read(&disk->part0, sectors[1]) -
6094                               atomic_read(&disk->sync_io);
6095                 /* sync IO will cause sync_io to increase before the disk_stats
6096                  * as sync_io is counted when a request starts, and
6097                  * disk_stats is counted when it completes.
6098                  * So resync activity will cause curr_events to be smaller than
6099                  * when there was no such activity.
6100                  * non-sync IO will cause disk_stat to increase without
6101                  * increasing sync_io so curr_events will (eventually)
6102                  * be larger than it was before.  Once it becomes
6103                  * substantially larger, the test below will cause
6104                  * the array to appear non-idle, and resync will slow
6105                  * down.
6106                  * If there is a lot of outstanding resync activity when
6107                  * we set last_event to curr_events, then all that activity
6108                  * completing might cause the array to appear non-idle
6109                  * and resync will be slowed down even though there might
6110                  * not have been non-resync activity.  This will only
6111                  * happen once though.  'last_events' will soon reflect
6112                  * the state where there is little or no outstanding
6113                  * resync requests, and further resync activity will
6114                  * always make curr_events less than last_events.
6115                  *
6116                  */
6117                 if (init || curr_events - rdev->last_events > 64) {
6118                         rdev->last_events = curr_events;
6119                         idle = 0;
6120                 }
6121         }
6122         rcu_read_unlock();
6123         return idle;
6124 }
6125
6126 void md_done_sync(mddev_t *mddev, int blocks, int ok)
6127 {
6128         /* another "blocks" (512byte) blocks have been synced */
6129         atomic_sub(blocks, &mddev->recovery_active);
6130         wake_up(&mddev->recovery_wait);
6131         if (!ok) {
6132                 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6133                 md_wakeup_thread(mddev->thread);
6134                 // stop recovery, signal do_sync ....
6135         }
6136 }
6137
6138
6139 /* md_write_start(mddev, bi)
6140  * If we need to update some array metadata (e.g. 'active' flag
6141  * in superblock) before writing, schedule a superblock update
6142  * and wait for it to complete.
6143  */
6144 void md_write_start(mddev_t *mddev, struct bio *bi)
6145 {
6146         int did_change = 0;
6147         if (bio_data_dir(bi) != WRITE)
6148                 return;
6149
6150         BUG_ON(mddev->ro == 1);
6151         if (mddev->ro == 2) {
6152                 /* need to switch to read/write */
6153                 mddev->ro = 0;
6154                 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6155                 md_wakeup_thread(mddev->thread);
6156                 md_wakeup_thread(mddev->sync_thread);
6157                 did_change = 1;
6158         }
6159         atomic_inc(&mddev->writes_pending);
6160         if (mddev->safemode == 1)
6161                 mddev->safemode = 0;
6162         if (mddev->in_sync) {
6163                 spin_lock_irq(&mddev->write_lock);
6164                 if (mddev->in_sync) {
6165                         mddev->in_sync = 0;
6166                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6167                         md_wakeup_thread(mddev->thread);
6168                         did_change = 1;
6169                 }
6170                 spin_unlock_irq(&mddev->write_lock);
6171         }
6172         if (did_change)
6173                 sysfs_notify_dirent(mddev->sysfs_state);
6174         wait_event(mddev->sb_wait,
6175                    !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
6176                    !test_bit(MD_CHANGE_PENDING, &mddev->flags));
6177 }
6178
6179 void md_write_end(mddev_t *mddev)
6180 {
6181         if (atomic_dec_and_test(&mddev->writes_pending)) {
6182                 if (mddev->safemode == 2)
6183                         md_wakeup_thread(mddev->thread);
6184                 else if (mddev->safemode_delay)
6185                         mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
6186         }
6187 }
6188
6189 /* md_allow_write(mddev)
6190  * Calling this ensures that the array is marked 'active' so that writes
6191  * may proceed without blocking.  It is important to call this before
6192  * attempting a GFP_KERNEL allocation while holding the mddev lock.
6193  * Must be called with mddev_lock held.
6194  *
6195  * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
6196  * is dropped, so return -EAGAIN after notifying userspace.
6197  */
6198 int md_allow_write(mddev_t *mddev)
6199 {
6200         if (!mddev->pers)
6201                 return 0;
6202         if (mddev->ro)
6203                 return 0;
6204         if (!mddev->pers->sync_request)
6205                 return 0;
6206
6207         spin_lock_irq(&mddev->write_lock);
6208         if (mddev->in_sync) {
6209                 mddev->in_sync = 0;
6210                 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6211                 if (mddev->safemode_delay &&
6212                     mddev->safemode == 0)
6213                         mddev->safemode = 1;
6214                 spin_unlock_irq(&mddev->write_lock);
6215                 md_update_sb(mddev, 0);
6216                 sysfs_notify_dirent(mddev->sysfs_state);
6217         } else
6218                 spin_unlock_irq(&mddev->write_lock);
6219
6220         if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
6221                 return -EAGAIN;
6222         else
6223                 return 0;
6224 }
6225 EXPORT_SYMBOL_GPL(md_allow_write);
6226
6227 #define SYNC_MARKS      10
6228 #define SYNC_MARK_STEP  (3*HZ)
6229 void md_do_sync(mddev_t *mddev)
6230 {
6231         mddev_t *mddev2;
6232         unsigned int currspeed = 0,
6233                  window;
6234         sector_t max_sectors,j, io_sectors;
6235         unsigned long mark[SYNC_MARKS];
6236         sector_t mark_cnt[SYNC_MARKS];
6237         int last_mark,m;
6238         struct list_head *tmp;
6239         sector_t last_check;
6240         int skipped = 0;
6241         mdk_rdev_t *rdev;
6242         char *desc;
6243
6244         /* just incase thread restarts... */
6245         if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
6246                 return;
6247         if (mddev->ro) /* never try to sync a read-only array */
6248                 return;
6249
6250         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6251                 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
6252                         desc = "data-check";
6253                 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6254                         desc = "requested-resync";
6255                 else
6256                         desc = "resync";
6257         } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6258                 desc = "reshape";
6259         else
6260                 desc = "recovery";
6261
6262         /* we overload curr_resync somewhat here.
6263          * 0 == not engaged in resync at all
6264          * 2 == checking that there is no conflict with another sync
6265          * 1 == like 2, but have yielded to allow conflicting resync to
6266          *              commense
6267          * other == active in resync - this many blocks
6268          *
6269          * Before starting a resync we must have set curr_resync to
6270          * 2, and then checked that every "conflicting" array has curr_resync
6271          * less than ours.  When we find one that is the same or higher
6272          * we wait on resync_wait.  To avoid deadlock, we reduce curr_resync
6273          * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
6274          * This will mean we have to start checking from the beginning again.
6275          *
6276          */
6277
6278         do {
6279                 mddev->curr_resync = 2;
6280
6281         try_again:
6282                 if (kthread_should_stop()) {
6283                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6284                         goto skip;
6285                 }
6286                 for_each_mddev(mddev2, tmp) {
6287                         if (mddev2 == mddev)
6288                                 continue;
6289                         if (!mddev->parallel_resync
6290                         &&  mddev2->curr_resync
6291                         &&  match_mddev_units(mddev, mddev2)) {
6292                                 DEFINE_WAIT(wq);
6293                                 if (mddev < mddev2 && mddev->curr_resync == 2) {
6294                                         /* arbitrarily yield */
6295                                         mddev->curr_resync = 1;
6296                                         wake_up(&resync_wait);
6297                                 }
6298                                 if (mddev > mddev2 && mddev->curr_resync == 1)
6299                                         /* no need to wait here, we can wait the next
6300                                          * time 'round when curr_resync == 2
6301                                          */
6302                                         continue;
6303                                 /* We need to wait 'interruptible' so as not to
6304                                  * contribute to the load average, and not to
6305                                  * be caught by 'softlockup'
6306                                  */
6307                                 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
6308                                 if (!kthread_should_stop() &&
6309                                     mddev2->curr_resync >= mddev->curr_resync) {
6310                                         printk(KERN_INFO "md: delaying %s of %s"
6311                                                " until %s has finished (they"
6312                                                " share one or more physical units)\n",
6313                                                desc, mdname(mddev), mdname(mddev2));
6314                                         mddev_put(mddev2);
6315                                         if (signal_pending(current))
6316                                                 flush_signals(current);
6317                                         schedule();
6318                                         finish_wait(&resync_wait, &wq);
6319                                         goto try_again;
6320                                 }
6321                                 finish_wait(&resync_wait, &wq);
6322                         }
6323                 }
6324         } while (mddev->curr_resync < 2);
6325
6326         j = 0;
6327         if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6328                 /* resync follows the size requested by the personality,
6329                  * which defaults to physical size, but can be virtual size
6330                  */
6331                 max_sectors = mddev->resync_max_sectors;
6332                 mddev->resync_mismatches = 0;
6333                 /* we don't use the checkpoint if there's a bitmap */
6334                 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
6335                         j = mddev->resync_min;
6336                 else if (!mddev->bitmap)
6337                         j = mddev->recovery_cp;
6338
6339         } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
6340                 max_sectors = mddev->dev_sectors;
6341         else {
6342                 /* recovery follows the physical size of devices */
6343                 max_sectors = mddev->dev_sectors;
6344                 j = MaxSector;
6345                 list_for_each_entry(rdev, &mddev->disks, same_set)
6346                         if (rdev->raid_disk >= 0 &&
6347                             !test_bit(Faulty, &rdev->flags) &&
6348                             !test_bit(In_sync, &rdev->flags) &&
6349                             rdev->recovery_offset < j)
6350                                 j = rdev->recovery_offset;
6351         }
6352
6353         printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
6354         printk(KERN_INFO "md: minimum _guaranteed_  speed:"
6355                 " %d KB/sec/disk.\n", speed_min(mddev));
6356         printk(KERN_INFO "md: using maximum available idle IO bandwidth "
6357                "(but not more than %d KB/sec) for %s.\n",
6358                speed_max(mddev), desc);
6359
6360         is_mddev_idle(mddev, 1); /* this initializes IO event counters */
6361
6362         io_sectors = 0;
6363         for (m = 0; m < SYNC_MARKS; m++) {
6364                 mark[m] = jiffies;
6365                 mark_cnt[m] = io_sectors;
6366         }
6367         last_mark = 0;
6368         mddev->resync_mark = mark[last_mark];
6369         mddev->resync_mark_cnt = mark_cnt[last_mark];
6370
6371         /*
6372          * Tune reconstruction:
6373          */
6374         window = 32*(PAGE_SIZE/512);
6375         printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
6376                 window/2,(unsigned long long) max_sectors/2);
6377
6378         atomic_set(&mddev->recovery_active, 0);
6379         last_check = 0;
6380
6381         if (j>2) {
6382                 printk(KERN_INFO
6383                        "md: resuming %s of %s from checkpoint.\n",
6384                        desc, mdname(mddev));
6385                 mddev->curr_resync = j;
6386         }
6387
6388         while (j < max_sectors) {
6389                 sector_t sectors;
6390
6391                 skipped = 0;
6392
6393                 if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6394                     ((mddev->curr_resync > mddev->curr_resync_completed &&
6395                       (mddev->curr_resync - mddev->curr_resync_completed)
6396                       > (max_sectors >> 4)) ||
6397                      (j - mddev->curr_resync_completed)*2
6398                      >= mddev->resync_max - mddev->curr_resync_completed
6399                             )) {
6400                         /* time to update curr_resync_completed */
6401                         blk_unplug(mddev->queue);
6402                         wait_event(mddev->recovery_wait,
6403                                    atomic_read(&mddev->recovery_active) == 0);
6404                         mddev->curr_resync_completed =
6405                                 mddev->curr_resync;
6406                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6407                         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6408                 }
6409
6410                 while (j >= mddev->resync_max && !kthread_should_stop()) {
6411                         /* As this condition is controlled by user-space,
6412                          * we can block indefinitely, so use '_interruptible'
6413                          * to avoid triggering warnings.
6414                          */
6415                         flush_signals(current); /* just in case */
6416                         wait_event_interruptible(mddev->recovery_wait,
6417                                                  mddev->resync_max > j
6418                                                  || kthread_should_stop());
6419                 }
6420
6421                 if (kthread_should_stop())
6422                         goto interrupted;
6423
6424                 sectors = mddev->pers->sync_request(mddev, j, &skipped,
6425                                                   currspeed < speed_min(mddev));
6426                 if (sectors == 0) {
6427                         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6428                         goto out;
6429                 }
6430
6431                 if (!skipped) { /* actual IO requested */
6432                         io_sectors += sectors;
6433                         atomic_add(sectors, &mddev->recovery_active);
6434                 }
6435
6436                 j += sectors;
6437                 if (j>1) mddev->curr_resync = j;
6438                 mddev->curr_mark_cnt = io_sectors;
6439                 if (last_check == 0)
6440                         /* this is the earliers that rebuilt will be
6441                          * visible in /proc/mdstat
6442                          */
6443                         md_new_event(mddev);
6444
6445                 if (last_check + window > io_sectors || j == max_sectors)
6446                         continue;
6447
6448                 last_check = io_sectors;
6449
6450                 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6451                         break;
6452
6453         repeat:
6454                 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
6455                         /* step marks */
6456                         int next = (last_mark+1) % SYNC_MARKS;
6457
6458                         mddev->resync_mark = mark[next];
6459                         mddev->resync_mark_cnt = mark_cnt[next];
6460                         mark[next] = jiffies;
6461                         mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
6462                         last_mark = next;
6463                 }
6464
6465
6466                 if (kthread_should_stop())
6467                         goto interrupted;
6468
6469
6470                 /*
6471                  * this loop exits only if either when we are slower than
6472                  * the 'hard' speed limit, or the system was IO-idle for
6473                  * a jiffy.
6474                  * the system might be non-idle CPU-wise, but we only care
6475                  * about not overloading the IO subsystem. (things like an
6476                  * e2fsck being done on the RAID array should execute fast)
6477                  */
6478                 blk_unplug(mddev->queue);
6479                 cond_resched();
6480
6481                 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
6482                         /((jiffies-mddev->resync_mark)/HZ +1) +1;
6483
6484                 if (currspeed > speed_min(mddev)) {
6485                         if ((currspeed > speed_max(mddev)) ||
6486                                         !is_mddev_idle(mddev, 0)) {
6487                                 msleep(500);
6488                                 goto repeat;
6489                         }
6490                 }
6491         }
6492         printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
6493         /*
6494          * this also signals 'finished resyncing' to md_stop
6495          */
6496  out:
6497         blk_unplug(mddev->queue);
6498
6499         wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
6500
6501         /* tell personality that we are finished */
6502         mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
6503
6504         if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
6505             mddev->curr_resync > 2) {
6506                 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
6507                         if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6508                                 if (mddev->curr_resync >= mddev->recovery_cp) {
6509                                         printk(KERN_INFO
6510                                                "md: checkpointing %s of %s.\n",
6511                                                desc, mdname(mddev));
6512                                         mddev->recovery_cp = mddev->curr_resync;
6513                                 }
6514                         } else
6515                                 mddev->recovery_cp = MaxSector;
6516                 } else {
6517                         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6518                                 mddev->curr_resync = MaxSector;
6519                         list_for_each_entry(rdev, &mddev->disks, same_set)
6520                                 if (rdev->raid_disk >= 0 &&
6521                                     !test_bit(Faulty, &rdev->flags) &&
6522                                     !test_bit(In_sync, &rdev->flags) &&
6523                                     rdev->recovery_offset < mddev->curr_resync)
6524                                         rdev->recovery_offset = mddev->curr_resync;
6525                 }
6526         }
6527         set_bit(MD_CHANGE_DEVS, &mddev->flags);
6528
6529  skip:
6530         mddev->curr_resync = 0;
6531         mddev->curr_resync_completed = 0;
6532         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6533                 /* We completed so max setting can be forgotten. */
6534                 mddev->resync_max = MaxSector;
6535         sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6536         wake_up(&resync_wait);
6537         set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6538         md_wakeup_thread(mddev->thread);
6539         return;
6540
6541  interrupted:
6542         /*
6543          * got a signal, exit.
6544          */
6545         printk(KERN_INFO
6546                "md: md_do_sync() got signal ... exiting\n");
6547         set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6548         goto out;
6549
6550 }
6551 EXPORT_SYMBOL_GPL(md_do_sync);
6552
6553
6554 static int remove_and_add_spares(mddev_t *mddev)
6555 {
6556         mdk_rdev_t *rdev;
6557         int spares = 0;
6558
6559         mddev->curr_resync_completed = 0;
6560
6561         list_for_each_entry(rdev, &mddev->disks, same_set)
6562                 if (rdev->raid_disk >= 0 &&
6563                     !test_bit(Blocked, &rdev->flags) &&
6564                     (test_bit(Faulty, &rdev->flags) ||
6565                      ! test_bit(In_sync, &rdev->flags)) &&
6566                     atomic_read(&rdev->nr_pending)==0) {
6567                         if (mddev->pers->hot_remove_disk(
6568                                     mddev, rdev->raid_disk)==0) {
6569                                 char nm[20];
6570                                 sprintf(nm,"rd%d", rdev->raid_disk);
6571                                 sysfs_remove_link(&mddev->kobj, nm);
6572                                 rdev->raid_disk = -1;
6573                         }
6574                 }
6575
6576         if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) {
6577                 list_for_each_entry(rdev, &mddev->disks, same_set) {
6578                         if (rdev->raid_disk >= 0 &&
6579                             !test_bit(In_sync, &rdev->flags) &&
6580                             !test_bit(Blocked, &rdev->flags))
6581                                 spares++;
6582                         if (rdev->raid_disk < 0
6583                             && !test_bit(Faulty, &rdev->flags)) {
6584                                 rdev->recovery_offset = 0;
6585                                 if (mddev->pers->
6586                                     hot_add_disk(mddev, rdev) == 0) {
6587                                         char nm[20];
6588                                         sprintf(nm, "rd%d", rdev->raid_disk);
6589                                         if (sysfs_create_link(&mddev->kobj,
6590                                                               &rdev->kobj, nm))
6591                                                 printk(KERN_WARNING
6592                                                        "md: cannot register "
6593                                                        "%s for %s\n",
6594                                                        nm, mdname(mddev));
6595                                         spares++;
6596                                         md_new_event(mddev);
6597                                 } else
6598                                         break;
6599                         }
6600                 }
6601         }
6602         return spares;
6603 }
6604 /*
6605  * This routine is regularly called by all per-raid-array threads to
6606  * deal with generic issues like resync and super-block update.
6607  * Raid personalities that don't have a thread (linear/raid0) do not
6608  * need this as they never do any recovery or update the superblock.
6609  *
6610  * It does not do any resync itself, but rather "forks" off other threads
6611  * to do that as needed.
6612  * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6613  * "->recovery" and create a thread at ->sync_thread.
6614  * When the thread finishes it sets MD_RECOVERY_DONE
6615  * and wakeups up this thread which will reap the thread and finish up.
6616  * This thread also removes any faulty devices (with nr_pending == 0).
6617  *
6618  * The overall approach is:
6619  *  1/ if the superblock needs updating, update it.
6620  *  2/ If a recovery thread is running, don't do anything else.
6621  *  3/ If recovery has finished, clean up, possibly marking spares active.
6622  *  4/ If there are any faulty devices, remove them.
6623  *  5/ If array is degraded, try to add spares devices
6624  *  6/ If array has spares or is not in-sync, start a resync thread.
6625  */
6626 void md_check_recovery(mddev_t *mddev)
6627 {
6628         mdk_rdev_t *rdev;
6629
6630
6631         if (mddev->bitmap)
6632                 bitmap_daemon_work(mddev->bitmap);
6633
6634         if (mddev->ro)
6635                 return;
6636
6637         if (signal_pending(current)) {
6638                 if (mddev->pers->sync_request && !mddev->external) {
6639                         printk(KERN_INFO "md: %s in immediate safe mode\n",
6640                                mdname(mddev));
6641                         mddev->safemode = 2;
6642                 }
6643                 flush_signals(current);
6644         }
6645
6646         if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6647                 return;
6648         if ( ! (
6649                 (mddev->flags && !mddev->external) ||
6650                 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6651                 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6652                 (mddev->external == 0 && mddev->safemode == 1) ||
6653                 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6654                  && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6655                 ))
6656                 return;
6657
6658         if (mddev_trylock(mddev)) {
6659                 int spares = 0;
6660
6661                 if (mddev->ro) {
6662                         /* Only thing we do on a ro array is remove
6663                          * failed devices.
6664                          */
6665                         remove_and_add_spares(mddev);
6666                         clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6667                         goto unlock;
6668                 }
6669
6670                 if (!mddev->external) {
6671                         int did_change = 0;
6672                         spin_lock_irq(&mddev->write_lock);
6673                         if (mddev->safemode &&
6674                             !atomic_read(&mddev->writes_pending) &&
6675                             !mddev->in_sync &&
6676                             mddev->recovery_cp == MaxSector) {
6677                                 mddev->in_sync = 1;
6678                                 did_change = 1;
6679                                 if (mddev->persistent)
6680                                         set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6681                         }
6682                         if (mddev->safemode == 1)
6683                                 mddev->safemode = 0;
6684                         spin_unlock_irq(&mddev->write_lock);
6685                         if (did_change)
6686                                 sysfs_notify_dirent(mddev->sysfs_state);
6687                 }
6688
6689                 if (mddev->flags)
6690                         md_update_sb(mddev, 0);
6691
6692                 list_for_each_entry(rdev, &mddev->disks, same_set)
6693                         if (test_and_clear_bit(StateChanged, &rdev->flags))
6694                                 sysfs_notify_dirent(rdev->sysfs_state);
6695
6696
6697                 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6698                     !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6699                         /* resync/recovery still happening */
6700                         clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6701                         goto unlock;
6702                 }
6703                 if (mddev->sync_thread) {
6704                         /* resync has finished, collect result */
6705                         md_unregister_thread(mddev->sync_thread);
6706                         mddev->sync_thread = NULL;
6707                         if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6708                             !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6709                                 /* success...*/
6710                                 /* activate any spares */
6711                                 if (mddev->pers->spare_active(mddev))
6712                                         sysfs_notify(&mddev->kobj, NULL,
6713                                                      "degraded");
6714                         }
6715                         if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
6716                             mddev->pers->finish_reshape)
6717                                 mddev->pers->finish_reshape(mddev);
6718                         md_update_sb(mddev, 1);
6719
6720                         /* if array is no-longer degraded, then any saved_raid_disk
6721                          * information must be scrapped
6722                          */
6723                         if (!mddev->degraded)
6724                                 list_for_each_entry(rdev, &mddev->disks, same_set)
6725                                         rdev->saved_raid_disk = -1;
6726
6727                         mddev->recovery = 0;
6728                         /* flag recovery needed just to double check */
6729                         set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6730                         sysfs_notify_dirent(mddev->sysfs_action);
6731                         md_new_event(mddev);
6732                         goto unlock;
6733                 }
6734                 /* Set RUNNING before clearing NEEDED to avoid
6735                  * any transients in the value of "sync_action".
6736                  */
6737                 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6738                 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6739                 /* Clear some bits that don't mean anything, but
6740                  * might be left set
6741                  */
6742                 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6743                 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6744
6745                 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6746                         goto unlock;
6747                 /* no recovery is running.
6748                  * remove any failed drives, then
6749                  * add spares if possible.
6750                  * Spare are also removed and re-added, to allow
6751                  * the personality to fail the re-add.
6752                  */
6753
6754                 if (mddev->reshape_position != MaxSector) {
6755                         if (mddev->pers->check_reshape == NULL ||
6756                             mddev->pers->check_reshape(mddev) != 0)
6757                                 /* Cannot proceed */
6758                                 goto unlock;
6759                         set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6760                         clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6761                 } else if ((spares = remove_and_add_spares(mddev))) {
6762                         clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6763                         clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6764                         clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6765                         set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6766                 } else if (mddev->recovery_cp < MaxSector) {
6767                         set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6768                         clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6769                 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6770                         /* nothing to be done ... */
6771                         goto unlock;
6772
6773                 if (mddev->pers->sync_request) {
6774                         if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6775                                 /* We are adding a device or devices to an array
6776                                  * which has the bitmap stored on all devices.
6777                                  * So make sure all bitmap pages get written
6778                                  */
6779                                 bitmap_write_all(mddev->bitmap);
6780                         }
6781                         mddev->sync_thread = md_register_thread(md_do_sync,
6782                                                                 mddev,
6783                                                                 "resync");
6784                         if (!mddev->sync_thread) {
6785                                 printk(KERN_ERR "%s: could not start resync"
6786                                         " thread...\n",
6787                                         mdname(mddev));
6788                                 /* leave the spares where they are, it shouldn't hurt */
6789                                 mddev->recovery = 0;
6790                         } else
6791                                 md_wakeup_thread(mddev->sync_thread);
6792                         sysfs_notify_dirent(mddev->sysfs_action);
6793                         md_new_event(mddev);
6794                 }
6795         unlock:
6796                 if (!mddev->sync_thread) {
6797                         clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6798                         if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6799                                                &mddev->recovery))
6800                                 if (mddev->sysfs_action)
6801                                         sysfs_notify_dirent(mddev->sysfs_action);
6802                 }
6803                 mddev_unlock(mddev);
6804         }
6805 }
6806
6807 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6808 {
6809         sysfs_notify_dirent(rdev->sysfs_state);
6810         wait_event_timeout(rdev->blocked_wait,
6811                            !test_bit(Blocked, &rdev->flags),
6812                            msecs_to_jiffies(5000));
6813         rdev_dec_pending(rdev, mddev);
6814 }
6815 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6816
6817 static int md_notify_reboot(struct notifier_block *this,
6818                             unsigned long code, void *x)
6819 {
6820         struct list_head *tmp;
6821         mddev_t *mddev;
6822
6823         if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6824
6825                 printk(KERN_INFO "md: stopping all md devices.\n");
6826
6827                 for_each_mddev(mddev, tmp)
6828                         if (mddev_trylock(mddev)) {
6829                                 /* Force a switch to readonly even array
6830                                  * appears to still be in use.  Hence
6831                                  * the '100'.
6832                                  */
6833                                 do_md_stop(mddev, 1, 100);
6834                                 mddev_unlock(mddev);
6835                         }
6836                 /*
6837                  * certain more exotic SCSI devices are known to be
6838                  * volatile wrt too early system reboots. While the
6839                  * right place to handle this issue is the given
6840                  * driver, we do want to have a safe RAID driver ...
6841                  */
6842                 mdelay(1000*1);
6843         }
6844         return NOTIFY_DONE;
6845 }
6846
6847 static struct notifier_block md_notifier = {
6848         .notifier_call  = md_notify_reboot,
6849         .next           = NULL,
6850         .priority       = INT_MAX, /* before any real devices */
6851 };
6852
6853 static void md_geninit(void)
6854 {
6855         dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6856
6857         proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6858 }
6859
6860 static int __init md_init(void)
6861 {
6862         if (register_blkdev(MD_MAJOR, "md"))
6863                 return -1;
6864         if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6865                 unregister_blkdev(MD_MAJOR, "md");
6866                 return -1;
6867         }
6868         blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE,
6869                             md_probe, NULL, NULL);
6870         blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6871                             md_probe, NULL, NULL);
6872
6873         register_reboot_notifier(&md_notifier);
6874         raid_table_header = register_sysctl_table(raid_root_table);
6875
6876         md_geninit();
6877         return 0;
6878 }
6879
6880
6881 #ifndef MODULE
6882
6883 /*
6884  * Searches all registered partitions for autorun RAID arrays
6885  * at boot time.
6886  */
6887
6888 static LIST_HEAD(all_detected_devices);
6889 struct detected_devices_node {
6890         struct list_head list;
6891         dev_t dev;
6892 };
6893
6894 void md_autodetect_dev(dev_t dev)
6895 {
6896         struct detected_devices_node *node_detected_dev;
6897
6898         node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6899         if (node_detected_dev) {
6900                 node_detected_dev->dev = dev;
6901                 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6902         } else {
6903                 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6904                         ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6905         }
6906 }
6907
6908
6909 static void autostart_arrays(int part)
6910 {
6911         mdk_rdev_t *rdev;
6912         struct detected_devices_node *node_detected_dev;
6913         dev_t dev;
6914         int i_scanned, i_passed;
6915
6916         i_scanned = 0;
6917         i_passed = 0;
6918
6919         printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6920
6921         while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6922                 i_scanned++;
6923                 node_detected_dev = list_entry(all_detected_devices.next,
6924                                         struct detected_devices_node, list);
6925                 list_del(&node_detected_dev->list);
6926                 dev = node_detected_dev->dev;
6927                 kfree(node_detected_dev);
6928                 rdev = md_import_device(dev,0, 90);
6929                 if (IS_ERR(rdev))
6930                         continue;
6931
6932                 if (test_bit(Faulty, &rdev->flags)) {
6933                         MD_BUG();
6934                         continue;
6935                 }
6936                 set_bit(AutoDetected, &rdev->flags);
6937                 list_add(&rdev->same_set, &pending_raid_disks);
6938                 i_passed++;
6939         }
6940
6941         printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6942                                                 i_scanned, i_passed);
6943
6944         autorun_devices(part);
6945 }
6946
6947 #endif /* !MODULE */
6948
6949 static __exit void md_exit(void)
6950 {
6951         mddev_t *mddev;
6952         struct list_head *tmp;
6953
6954         blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS);
6955         blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6956
6957         unregister_blkdev(MD_MAJOR,"md");
6958         unregister_blkdev(mdp_major, "mdp");
6959         unregister_reboot_notifier(&md_notifier);
6960         unregister_sysctl_table(raid_table_header);
6961         remove_proc_entry("mdstat", NULL);
6962         for_each_mddev(mddev, tmp) {
6963                 export_array(mddev);
6964                 mddev->hold_active = 0;
6965         }
6966 }
6967
6968 subsys_initcall(md_init);
6969 module_exit(md_exit)
6970
6971 static int get_ro(char *buffer, struct kernel_param *kp)
6972 {
6973         return sprintf(buffer, "%d", start_readonly);
6974 }
6975 static int set_ro(const char *val, struct kernel_param *kp)
6976 {
6977         char *e;
6978         int num = simple_strtoul(val, &e, 10);
6979         if (*val && (*e == '\0' || *e == '\n')) {
6980                 start_readonly = num;
6981                 return 0;
6982         }
6983         return -EINVAL;
6984 }
6985
6986 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6987 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6988
6989 module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR);
6990
6991 EXPORT_SYMBOL(register_md_personality);
6992 EXPORT_SYMBOL(unregister_md_personality);
6993 EXPORT_SYMBOL(md_error);
6994 EXPORT_SYMBOL(md_done_sync);
6995 EXPORT_SYMBOL(md_write_start);
6996 EXPORT_SYMBOL(md_write_end);
6997 EXPORT_SYMBOL(md_register_thread);
6998 EXPORT_SYMBOL(md_unregister_thread);
6999 EXPORT_SYMBOL(md_wakeup_thread);
7000 EXPORT_SYMBOL(md_check_recovery);
7001 MODULE_LICENSE("GPL");
7002 MODULE_ALIAS("md");
7003 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);